Yu-Gi-Oh! Duel Monsters II: Dark duel Stories:ROM map
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The following article is a ROM map for Yu-Gi-Oh! Duel Monsters II: Dark Duel Stories.
Bank 0
rst 00
ROM0:0000 F3 di ROM0:0001 C3 9B 17 jp 179B
rst 08
ROM0:0008 C3 D5 11 jp 11D5
rst 10 (error trap)
ROM0:0010 18 FE jr 0010
rst 18 (error trap)
ROM0:0018 18 FE jr 0018
rst 20 (error trap)
ROM0:0020 18 FE jr 0020
rst 28 (error trap)
ROM0:0028 18 FE jr 0028
rst 30 (error trap)
ROM0:0030 18 FE jr 0030
rst 38 (error trap)
ROM0:0038 18 FE jr 0038
rst 40 (vblank)
ROM0:0040 C3 36 04 jp 0436
rst 48 (LCD)
ROM0:0048 C3 0F DD jp DD0F
rst 50 (timer)
ROM0:0050 C3 2C 17 jp 172C
rst 58 (serial)
ROM0:0058 C3 EC 01 jp 01EC
rst 60 (joypad)
ROM0:0060 18 FE jr 0060
ROM start
ROM0:0100 00 nop ROM0:0101 C3 50 01 jp 0150
ROM0:0150 E0 DD ld (ff00+DD),a // System running the game ROM0:0152 21 00 D0 ld hl,D000 ROM0:0155 F9 ld sp,hl ROM0:0156 21 A0 D5 ld hl,D5A0 ROM0:0159 11 00 00 ld de,0000 ROM0:015C 0E 00 ld c,00 ROM0:015E 1A ld a,(de) ROM0:015F 22 ldi (hl),a ROM0:0160 13 inc de ROM0:0161 0D dec c ROM0:0162 20 FA jr nz,015E ROM0:0164 0E 00 ld c,00 ROM0:0166 1A ld a,(de) ROM0:0167 22 ldi (hl),a ROM0:0168 13 inc de ROM0:0169 0D dec c ROM0:016A 20 FA jr nz,0166 ROM0:016C 0E 00 ld c,00 ROM0:016E 1A ld a,(de) ROM0:016F 22 ldi (hl),a ROM0:0170 13 inc de ROM0:0171 0D dec c ROM0:0172 20 FA jr nz,016E ROM0:0174 CD 22 12 call 1222 // Initialize Bank, enable Interrupts ROM0:0177 CF rst 08
ROM0:0178 07 rlca ROM0:0179 04 inc b ROM0:017A CD F5 31 call 31F5 // (DD07) = 0 ROM0:017D 3E 00 ld a,00 ROM0:017F CF rst 08
Wait for vblank
- 0x436-0x45E - Wait for vblank
ROM0:0436 F5 push af ROM0:0437 E5 push hl ROM0:0438 C5 push bc ROM0:0439 D5 push de ROM0:043A 06 00 ld b,00 ROM0:043C FA 7D D8 ld a,(D87D) ROM0:043F 4F ld c,a ROM0:0440 21 48 04 ld hl,0448 ROM0:0443 09 add hl,bc ROM0:0444 2A ldi a,(hl) ROM0:0445 66 ld h,(hl) ROM0:0446 6F ld l,a ROM0:0447 E9 jp hl ROM0:0448 66 ld h,(hl) ROM0:0449 04 inc b ROM0:044A 7F ld a,a ROM0:044B 04 inc b ROM0:044C A5 and l ROM0:044D 04 inc b ROM0:044E CE 04 adc a,04 ROM0:0450 41 ld b,c ROM0:0451 05 dec b ROM0:0452 F0 06 ld a,(ff00+06) // TIMEMOD ROM0:0454 48 ld c,b ROM0:0455 08 22 09 ld (0922),sp ROM0:0458 68 ld l,b ROM0:0459 0A ld a,(bc) ROM0:045A C0 ret nz ROM0:045B 0B dec bc ROM0:045C 61 ld h,c ROM0:045D 0C inc c ROM0:045E C3 30 4C jp 4C30
0:0F16 (called by Main Menu)
- 0xF16-0xF33 - ? (called by Main Menu)
ROM0:0F16 F5 push af ROM0:0F17 C5 push bc ROM0:0F18 E5 push hl ROM0:0F19 EA 7C D8 ld (D87C),a ROM0:0F1C 4F ld c,a ROM0:0F1D 06 00 ld b,00 ROM0:0F1F 21 34 0F ld hl,0F34 ROM0:0F22 09 add hl,bc ROM0:0F23 2A ldi a,(hl) ROM0:0F24 66 ld h,(hl) ROM0:0F25 6F ld l,a ROM0:0F26 01 2B 0F ld bc,0F2B ROM0:0F29 C5 push bc ROM0:0F2A E9 jp hl ROM0:0F2B 3E 00 ld a,00 ROM0:0F2D EA 7B D8 ld (D87B),a ROM0:0F30 E1 pop hl ROM0:0F31 C1 pop bc ROM0:0F32 F1 pop af ROM0:0F33 C9 ret
0:1107 (call 0:1881)
ROM0:1107 F5 push af
ROM0:1108 CD 81 18 call 1881
80 E4
0:110D (reti from 0:1881)
ROM0:110D CD 9B 17 call 179B
ROM0:1110 CD 60 18 call 1860
80 E4
ROM0:1115 28 F6 jr z,110D
ROM0:1117 F1 pop af
ROM0:1118 C9 ret
rst 08 instructions
- 0x11D5-0x120A - rst 08 jumps here: bank switch, load pointer to next instructions
ROM0:11D5 F5 push af ROM0:11D6 E8 FD add sp,FD ROM0:11D8 F5 push af ROM0:11D9 E5 push hl ROM0:11DA C5 push bc ROM0:11DB D5 push de ROM0:11DC F8 06 ld hl,sp+06 ROM0:11DE 54 ld d,h ROM0:11DF 5D ld e,l ROM0:11E0 F8 0E ld hl,sp+0E ROM0:11E2 3A ldd a,(hl) ROM0:11E3 47 ld b,a ROM0:11E4 3A ldd a,(hl) ROM0:11E5 4F ld c,a ROM0:11E6 FA 00 40 ld a,(4000) // Load current Bank in accumulator ROM0:11E9 32 ldd (hl),a ROM0:11EA 7E ld a,(hl) ROM0:11EB 12 ld (de),a ROM0:11EC 3E 12 ld a,12 ROM0:11EE 32 ldd (hl),a ROM0:11EF 3E 0B ld a,0B ROM0:11F1 32 ldd (hl),a ROM0:11F2 0A ld a,(bc) ROM0:11F3 5F ld e,a ROM0:11F4 03 inc bc ROM0:11F5 16 40 ld d,40 ROM0:11F7 0A ld a,(bc) ROM0:11F8 03 inc bc ROM0:11F9 EA 00 20 ld (2000),a // Bank switch ROM0:11FC 1A ld a,(de) ROM0:11FD 32 ldd (hl),a ROM0:11FE 1D dec e ROM0:11FF 1A ld a,(de) ROM0:1200 77 ld (hl),a // Address to return to ROM0:1201 F8 0D ld hl,sp+0D ROM0:1203 79 ld a,c ROM0:1204 22 ldi (hl),a ROM0:1205 70 ld (hl),b ROM0:1206 D1 pop de ROM0:1207 C1 pop bc ROM0:1208 E1 pop hl ROM0:1209 F1 pop af ROM0:120A C9 ret
Initialize Bank and enable Interrupts
ROM0:1222 F5 push af ROM0:1223 F3 di ROM0:1224 3E 00 ld a,00 ROM0:1226 EA 00 20 ld (2000),a ;ROM Bank 0 ROM0:1229 3E 00 ld a,00 ROM0:122B EA 00 30 ld (3000),a ROM0:122E 3E 00 ld a,00 ROM0:1230 EA 00 40 ld (4000),a ;RAM Bank 0 ROM0:1233 3E 00 ld a,00 ROM0:1235 E0 4F ld (ff00+4F),a ROM0:1237 FB ei ROM0:1238 F1 pop af ROM0:1239 C9 ret
Bank switch
- 0x123A-0x123D - Bank switch
ROM0:123A EA 00 20 ld (2000),a ROM0:123D C9 ret
0:13BE (to document)
- 0x13BE-0x13E3 - ?
ROM0:13BE F5 push af ROM0:13BF E5 push hl ROM0:13C0 D5 push de ROM0:13C1 16 00 ld d,00 ROM0:13C3 CB 23 sla e ROM0:13C5 CB 23 sla e ROM0:13C7 21 00 D5 ld hl,D500 ROM0:13CA 19 add hl,de // hl = D500 + (e × 4) ROM0:13CB D1 pop de ROM0:13CC 79 ld a,c ROM0:13CD 22 ldi (hl),a ROM0:13CE 78 ld a,b ROM0:13CF 22 ldi (hl),a ROM0:13D0 7A ld a,d ROM0:13D1 22 ldi (hl),a ROM0:13D2 3E 00 ld a,00 ROM0:13D4 22 ldi (hl),a ROM0:13D5 79 ld a,c ROM0:13D6 22 ldi (hl),a ROM0:13D7 78 ld a,b ROM0:13D8 C6 08 add a,08 ROM0:13DA 22 ldi (hl),a ROM0:13DB 7A ld a,d ROM0:13DC C6 02 add a,02 ROM0:13DE 22 ldi (hl),a ROM0:13DF 36 00 ld (hl),00 ROM0:13E1 E1 pop hl ROM0:13E2 F1 pop af ROM0:13E3 C9 ret
Alt PRNG
- 0x1403-0x1419 - ?
ROM0:1403 F5 push af ROM0:1404 C5 push bc ROM0:1405 1E 00 ld e,00 ROM0:1407 0E 08 ld c,08 ROM0:1409 CB 22 sla d ROM0:140B CB 13 rl e ROM0:140D 7B ld a,e ROM0:140E B8 cp b ROM0:140F 38 03 jr c,1414 ROM0:1411 90 sub b ROM0:1412 5F ld e,a ROM0:1413 14 inc d ROM0:1414 0D dec c ROM0:1415 20 F2 jr nz,1409 ROM0:1417 C1 pop bc ROM0:1418 F1 pop af ROM0:1419 C9 ret
? operation
- 0x14A2-0x14C1 - ? operation
ROM0:14A2 F5 push af ROM0:14A3 78 ld a,b ROM0:14A4 BA cp d ROM0:14A5 20 0B jr nz,14B2 // If(PRN ≠ b), jump to 0:14B2 ROM0:14A7 79 ld a,c ROM0:14A8 BB cp e ROM0:14A9 20 07 jr nz,14B2 // If(e ≠ c), jump to 0:14B2 ROM0:14AB 01 00 00 ld bc,0000 ROM0:14AE 1E 01 ld e,01 ROM0:14B0 18 0E jr 14C0 // Else bc = 0, e = 1, and get out of this function ROM0:14B2 7B ld a,e ROM0:14B3 91 sub c ROM0:14B4 27 daa ROM0:14B5 4F ld c,a ROM0:14B6 7A ld a,d ROM0:14B7 98 sbc b ROM0:14B8 27 daa ROM0:14B9 47 ld b,a // b = PRN - ((max - min) + 1) ROM0:14BA 1E 02 ld e,02 ROM0:14BC 30 02 jr nc,14C0 ROM0:14BE 1E 00 ld e,00 ROM0:14C0 F1 pop af ROM0:14C1 C9 ret
0:179B (to document)
- 0x179B-0x180A - ?
ROM0:179B E5 push hl ROM0:179C 21 FF FF ld hl,FFFF ROM0:179F CB 96 res 2,(hl) ROM0:17A1 F5 push af ROM0:17A2 C5 push bc ROM0:17A3 D5 push de ROM0:17A4 F3 di ROM0:17A5 F0 DF ld a,(ff00+DF) ROM0:17A7 4F ld c,a ROM0:17A8 D6 E0 sub a,E0 ROM0:17AA 47 ld b,a ROM0:17AB 07 rlca ROM0:17AC 80 add b ROM0:17AD 5F ld e,a ROM0:17AE 3E 00 ld a,00 ROM0:17B0 E2 ld (ff00+c),a ROM0:17B1 0C inc c ROM0:17B2 79 ld a,c ROM0:17B3 FE E4 cp a,E4 ROM0:17B5 20 02 jr nz,17B9 ROM0:17B7 0E E0 ld c,E0 ROM0:17B9 F2 ld a,(ff00+c) ROM0:17BA FE 01 cp a,01 ROM0:17BC 20 F3 jr nz,17B1 ROM0:17BE 79 ld a,c ROM0:17BF E0 DF ld (ff00+DF),a ROM0:17C1 3E 02 ld a,02 ROM0:17C3 E2 ld (ff00+c),a ROM0:17C4 3E E8 ld a,E8 ROM0:17C6 83 add e ROM0:17C7 4F ld c,a ROM0:17C8 F8 00 ld hl,sp+00 ROM0:17CA 7D ld a,l ROM0:17CB E2 ld (ff00+c),a ROM0:17CC 0C inc c ROM0:17CD 7C ld a,h ROM0:17CE E2 ld (ff00+c),a ROM0:17CF 0C inc c ROM0:17D0 FA 00 40 ld a,(4000) ROM0:17D3 E2 ld (ff00+c),a ROM0:17D4 F0 DF ld a,(ff00+DF) ROM0:17D6 D6 E0 sub a,E0 ROM0:17D8 47 ld b,a ROM0:17D9 07 rlca ROM0:17DA 80 add b ROM0:17DB 5F ld e,a ROM0:17DC C6 E8 add a,E8 ROM0:17DE 4F ld c,a ROM0:17DF F2 ld a,(ff00+c) ROM0:17E0 6F ld l,a ROM0:17E1 0C inc c ROM0:17E2 F2 ld a,(ff00+c) ROM0:17E3 67 ld h,a ROM0:17E4 F9 ld sp,hl ROM0:17E5 0C inc c ROM0:17E6 F2 ld a,(ff00+c) ROM0:17E7 EA 00 20 ld (2000),a ROM0:17EA 16 00 ld d,00 ROM0:17EC 21 EF 16 ld hl,16EF ROM0:17EF 19 add hl,de ROM0:17F0 7E ld a,(hl) ROM0:17F1 E0 05 ld (ff00+05),a // TIMECNT ROM0:17F3 2A ldi a,(hl) ROM0:17F4 E0 06 ld (ff00+06),a // TIMEMOD ROM0:17F6 2A ldi a,(hl) ROM0:17F7 E0 07 ld (ff00+07),a // TIMCONT ROM0:17F9 7E ld a,(hl) ROM0:17FA E0 07 ld (ff00+07),a ROM0:17FC D1 pop de ROM0:17FD C1 pop bc ROM0:17FE F1 pop af ROM0:17FF 21 0F FF ld hl,FF0F ROM0:1802 CB 96 res 2,(hl) ROM0:1804 2E FF ld l,FF ROM0:1806 CB D6 set 2,(hl) ROM0:1808 E1 pop hl ROM0:1809 D9 reti ROM0:180A C9 ret
0:1832 (error trap)
ROM0:1832 18 FE jr 1832
0:1881
ROM0:1881 F5 push af ROM0:1882 C5 push bc ROM0:1883 D5 push de ROM0:1884 E5 push hl ROM0:1885 F8 08 ld hl,sp+08 ROM0:1887 2A ldi a,(hl) ROM0:1888 5F ld e,a ROM0:1889 56 ld d,(hl) ROM0:188A 1A ld a,(de) ROM0:188B 47 ld b,a ROM0:188C 13 inc de ROM0:188D 1A ld a,(de) ROM0:188E 4F ld c,a ROM0:188F 13 inc de ROM0:1890 7A ld a,d ROM0:1891 32 ldd (hl),a ROM0:1892 73 ld (hl),e ROM0:1893 F3 di ROM0:1894 3E FF ld a,FF ROM0:1896 A8 xor b ROM0:1897 47 ld b,a ROM0:1898 F2 ld a,(ff00+c) ROM0:1899 A0 and b ROM0:189A E2 ld (ff00+c),a ROM0:189B E1 pop hl ROM0:189C D1 pop de ROM0:189D C1 pop bc ROM0:189E F1 pop af ROM0:189F D9 reti ROM0:18A0 C9 ret
0:1CE4 (to document)
- 0x1CE4-0x1CEE - ?
ROM0:1CE4 F5 push af ROM0:1CE5 78 ld a,b ROM0:1CE6 EA 6B DA ld (DA6B),a ROM0:1CE9 79 ld a,c ROM0:1CEA EA 6C DA ld (DA6C),a ROM0:1CED F1 pop af ROM0:1CEE C9 ret
Write Fusion Monster ID to the selected area
ROM0:1D0F F5 push af ROM0:1D10 C5 push bc ROM0:1D11 E5 push hl ROM0:1D12 CD 4A 1D call 1D4A ROM0:1D15 60 ld h,b ROM0:1D16 69 ld l,c ROM0:1D17 FA 6D DA ld a,(DA6D) ROM0:1D1A 22 ldi (hl),a ;Copy monster ID from wDA6D to the selected area ROM0:1D1B FA 6E DA ld a,(DA6E) ROM0:1D1E 22 ldi (hl),a ROM0:1D1F FA 6F DA ld a,(DA6F) ROM0:1D22 22 ldi (hl),a ;Copy card flags from wDA6F to the selected area ROM0:1D23 E1 pop hl ROM0:1D24 C1 pop bc ROM0:1D25 F1 pop af ROM0:1D26 C9 ret
ROM0:1D27 F5 push af ROM0:1D28 C5 push bc ROM0:1D29 E5 push hl ROM0:1D2A CD 4A 1D call 1D4A ROM0:1D2D 60 ld h,b
0:1D2E
ROM0:1D2E 69 ld l,c ROM0:1D2F 2A ldi a,(hl) ROM0:1D30 EA 6D DA ld (DA6D),a ROM0:1D33 2A ldi a,(hl) ROM0:1D34 EA 6E DA ld (DA6E),a ROM0:1D37 2A ldi a,(hl) ROM0:1D38 EA 6F DA ld (DA6F),a ROM0:1D3B E1 pop hl ROM0:1D3C C1 pop bc ROM0:1D3D F1 pop af ROM0:1D3E C9 ret
Call Fusion check
ROM0:1D3F F5 push af ROM0:1D40 C5 push bc ROM0:1D41 CF rst 08 ROM0:1D42 05 dec b ROM0:1D43 09 add hl,bc ROM0:1D44 CD 0F 1D call 1D0F ROM0:1D47 C1 pop bc ROM0:1D48 F1 pop af ROM0:1D49 C9 ret
0:1D4A
ROM0:1D4A F5 push af ROM0:1D4B E5 push hl ROM0:1D4C 06 00 ld b,00 ROM0:1D4E FA 6C DA ld a,(DA6C) ROM0:1D51 4F ld c,a ROM0:1D52 CB 21 sla c ROM0:1D54 21 72 1D ld hl,1D72 ROM0:1D57 09 add hl,bc ROM0:1D58 2A ldi a,(hl) ROM0:1D59 66 ld h,(hl) ROM0:1D5A 6F ld l,a ROM0:1D5B E5 push hl ROM0:1D5C 06 00 ld b,00 ROM0:1D5E FA 6B DA ld a,(DA6B) ROM0:1D61 4F ld c,a ROM0:1D62 CB 21 sla c ROM0:1D64 21 7A 1D ld hl,1D7A ROM0:1D67 09 add hl,bc ROM0:1D68 2A ldi a,(hl) ROM0:1D69 46 ld b,(hl) ROM0:1D6A 4F ld c,a ROM0:1D6B E1 pop hl ROM0:1D6C 09 add hl,bc ROM0:1D6D 44 ld b,h ROM0:1D6E 4D ld c,l ROM0:1D6F E1 pop hl ROM0:1D70 F1 pop af ROM0:1D71 C9 ret
Checks if Card ID is 721
- 0x1D86-0x1D97 - ?
ROM0:1D86 D5 push de ROM0:1D87 1E 00 ld e,00 ROM0:1D89 78 ld a,b ROM0:1D8A FE 02 cp a,02 ROM0:1D8C 20 07 jr nz,1D95 ROM0:1D8E 79 ld a,c ROM0:1D8F FE D0 cp a,D0 ROM0:1D91 20 02 jr nz,1D95 ROM0:1D93 1E 01 ld e,01 ROM0:1D95 7B ld a,e ROM0:1D96 D1 pop de ROM0:1D97 C9 ret
0:1DA7 (to document)
- 0x1DA7-0x1DC1 - ?
ROM0:1DA7 C5 push bc ROM0:1DA8 D5 push de ROM0:1DA9 E5 push hl ROM0:1DAA 2E 02 ld l,02 ROM0:1DAC CD A2 14 call 14A2 ROM0:1DAF 7B ld a,e ROM0:1DB0 FE 01 cp a,01 ROM0:1DB2 20 02 jr nz,1DB6 ROM0:1DB4 2E 01 ld l,01 ROM0:1DB6 7B ld a,e ROM0:1DB7 FE 00 cp a,00 ROM0:1DB9 20 02 jr nz,1DBD ROM0:1DBB 2E 00 ld l,00 ROM0:1DBD 7D ld a,l ROM0:1DBE E1 pop hl ROM0:1DBF D1 pop de ROM0:1DC0 C1 pop bc ROM0:1DC1 C9 ret
PRNG
- 0x20DB-0x210A - Pseudo-Random Number Generator
ROM0:20DB F5 push af ROM0:20DC C5 push bc ROM0:20DD D5 push de ROM0:20DE FA 19 DB ld a,(DB19) ROM0:20E1 47 ld b,a ROM0:20E2 4F ld c,a ROM0:20E3 FA 18 DB ld a,(DB18) ROM0:20E6 CB 19 rr c ROM0:20E8 1F rra ROM0:20E9 CB 1A rr d ROM0:20EB A8 xor b ROM0:20EC CB 12 rl d ROM0:20EE 17 rla ROM0:20EF CB 11 rl c ROM0:20F1 EA 19 DB ld (DB19),a ROM0:20F4 FA 17 DB ld a,(DB17) ROM0:20F7 EA 18 DB ld (DB18),a ROM0:20FA FA 16 DB ld a,(DB16) ROM0:20FD EA 17 DB ld (DB17),a ROM0:2100 79 ld a,c ROM0:2101 EA 16 DB ld (DB16),a ROM0:2104 EA 1C DB ld (DB1C),a ROM0:2107 D1 pop de ROM0:2108 C1 pop bc ROM0:2109 F1 pop af ROM0:210A C9 ret
Pseudo-Random Number between m and n
- 0x210B-0x2132 - Stores a Pseudo-Random Number between (DB1A) and (DB1B) in (DB1C)
ROM0:210B F5 push af ROM0:210C C5 push bc ROM0:210D D5 push de ROM0:210E FA 1A DB ld a,(DB1A) // Min value for PRN ROM0:2111 4F ld c,a ROM0:2112 FA 1B DB ld a,(DB1B) // Max value for PRN ROM0:2115 B9 cp c ROM0:2116 20 05 jr nz,211D // If(min ≠ max), jump to 0:211D ROM0:2118 EA 1C DB ld (DB1C),a // PRN = max ROM0:211B 18 12 jr 212F // Get out of this function ROM0:211D 91 sub c ROM0:211E 47 ld b,a ROM0:211F 04 inc b // b = (max - min) + 1 ROM0:2120 CD DB 20 call 20DB // PRNG ROM0:2123 FA 1C DB ld a,(DB1C) ROM0:2126 57 ld d,a // d = PRN ROM0:2127 CD 03 14 call 1403 // ? operation; set e to 0, 1 or 2 ROM0:212A 7B ld a,e ROM0:212B 81 add c // a = e + min ROM0:212C EA 1C DB ld (DB1C),a // Store the value in (DB1C) ROM0:212F D1 pop de ROM0:2130 C1 pop bc ROM0:2131 F1 pop af ROM0:2132 C9 ret
Gives a random Card 1
- 0x2507-0x2566 - ?
ROM0:2507 F5 push af ROM0:2508 D5 push de ROM0:2509 E5 push hl ROM0:250A 3E 00 ld a,00 ROM0:250C EA 1A DB ld (DB1A),a ROM0:250F 3E FF ld a,FF ROM0:2511 EA 1B DB ld (DB1B),a ROM0:2514 CD 0B 21 call 210B ROM0:2517 FA 1C DB ld a,(DB1C) ROM0:251A 5F ld e,a ROM0:251B 3E 00 ld a,00 ROM0:251D EA 1A DB ld (DB1A),a ROM0:2520 3E 07 ld a,07 ROM0:2522 EA 1B DB ld (DB1B),a ROM0:2525 CD 0B 21 call 210B ROM0:2528 FA 1C DB ld a,(DB1C) ROM0:252B 57 ld d,a ROM0:252C 60 ld h,b ROM0:252D 69 ld l,c // Set hl to pointer from RO40:410D ROM0:252E 01 00 00 ld bc,0000 ROM0:2531 AF xor a ROM0:2532 F5 push af ROM0:2533 C5 push bc ROM0:2534 E6 01 and a,01 ROM0:2536 20 14 jr nz,254C ROM0:2538 2A ldi a,(hl) ROM0:2539 47 ld b,a ROM0:253A 7E ld a,(hl) ROM0:253B E6 F0 and a,F0 ROM0:253D CB 38 srl b ROM0:253F 1F rra ROM0:2540 CB 38 srl b ROM0:2542 1F rra ROM0:2543 CB 38 srl b ROM0:2545 1F rra ROM0:2546 CB 38 srl b ROM0:2548 1F rra ROM0:2549 4F ld c,a ROM0:254A 18 06 jr 2552 ROM0:254C 2A ldi a,(hl) ROM0:254D E6 0F and a,0F ROM0:254F 47 ld b,a ROM0:2550 2A ldi a,(hl) ROM0:2551 4F ld c,a ROM0:2552 CD A7 1D call 1DA7 ROM0:2555 C1 pop bc ROM0:2556 FE 00 cp a,00 ROM0:2558 20 04 jr nz,255E ROM0:255A E8 02 add sp,02 ROM0:255C 18 05 jr 2563 ROM0:255E 03 inc bc ROM0:255F F1 pop af ROM0:2560 3C inc a ROM0:2561 18 CF jr 2532 ROM0:2563 E1 pop hl ROM0:2564 D1 pop de ROM0:2565 F1 pop af ROM0:2566 C9 ret
Stage 5 opponents Decks IDs
- 0x25BE-0x25CC - Loads Stage 5 opponent's Deck ID
ROM0:25BE 23 inc hl ROM0:25BF 04 inc b ROM0:25C0 06 00 ld b,00 ROM0:25C2 4F ld c,a ROM0:25C3 21 CD 25 ld hl,25CD ROM0:25C6 09 add hl,bc ROM0:25C7 7E ld a,(hl) ROM0:25C8 EA 87 DB ld (DB87),a ROM0:25CB F1 pop af ROM0:25CC C9 ret
- 0x25CD-0x25D0 - Stage 5 opponents Decks IDs
ROM0:25CD 0F 12 13 14
Gives a random Card 2
- 0x29E7-0x2A04 - ?
ROM0:29E7 F5 push af ROM0:29E8 D5 push de ROM0:29E9 E5 push hl ROM0:29EA FA 00 40 ld a,(4000) ROM0:29ED F5 push af ROM0:29EE 3E 40 ld a,40 ROM0:29F0 CD 3A 12 call 123A // Switch to Bank 40 ROM0:29F3 CD 23 40 call 4023 ROM0:29F6 7A ld a,d ROM0:29F7 CD 3A 12 call 123A // Switch to Bank 24 or 25, from RO40:410D ROM0:29FA CD 07 25 call 2507 ROM0:29FD F1 pop af ROM0:29FE CD 3A 12 call 123A // Switch to Bank D ROM0:2A01 E1 pop hl ROM0:2A02 D1 pop de ROM0:2A03 F1 pop af ROM0:2A04 C9 ret
Initialize Duel Records
- 0x2A10-0x2A2A - Sets Duel Records to either 0 duels, or 9 duels if debug game
ROM0:2A10 FE 00 cp a,00 ROM0:2A12 20 05 jr nz,2A19 // If debug, jump to 0:2A19 ROM0:2A14 11 49 2A ld de,2A49 ROM0:2A17 18 03 jr 2A1C // Else, jump to 0:2A1C ROM0:2A19 11 A1 2A ld de,2AA1 ROM0:2A1C 0E 16 ld c,16 ROM0:2A1E 1A ld a,(de) ROM0:2A1F 22 ldi (hl),a ROM0:2A20 13 inc de ROM0:2A21 1A ld a,(de) ROM0:2A22 22 ldi (hl),a ROM0:2A23 13 inc de ROM0:2A24 0D dec c ROM0:2A25 20 F7 jr nz,2A1E ROM0:2A27 21 FB DB ld hl,DBFB ROM0:2A2A CF rst 08
- 0x2A2D-0x2A48 - Sets Duel Records to either 0 wins, or 9 wins if debug game
ROM0:2A2D FE 00 cp a,00 ROM0:2A2F 20 05 jr nz,2A36 // If debug, jump to 0:2A36 ROM0:2A31 11 75 2A ld de,2A75 ROM0:2A34 18 03 jr 2A39 // Else, jump to 0:2A39 ROM0:2A36 11 CD 2A ld de,2ACD ROM0:2A39 0E 16 ld c,16 ROM0:2A3B 1A ld a,(de) ROM0:2A3C 22 ldi (hl),a ROM0:2A3D 13 inc de ROM0:2A3E 1A ld a,(de) ROM0:2A3F 22 ldi (hl),a ROM0:2A40 13 inc de ROM0:2A41 0D dec c ROM0:2A42 20 F7 jr nz,2A3B ROM0:2A44 E1 pop hl ROM0:2A45 D1 pop de ROM0:2A46 C1 pop bc ROM0:2A47 F1 pop af ROM0:2A48 C9 ret
- 0x2A49-0x2AA0 - Duel Records
ROM0:2A49 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
- 0x2AA1-0x2AF8 - Debug Duel Records
ROM0:2AA1 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 04 00 04 00 04 00 04 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 09 00 04 00 04 00 04 00 04
idk for now
Set wC920 to accumulator
ROM0:2D0A F5 push af
ROM0:2D0B C5 push bc
ROM0:2D0C D5 push de
ROM0:2D0D E5 push hl
ROM0:2D0E CF rst 08
07 3E => pointer 3E:4007, function 3E:4076 - Set wC920 to accumulator
ROM0:2D11 E1 pop hl
ROM0:2D12 D1 pop de
ROM0:2D13 C1 pop bc
ROM0:2D14 F1 pop af
ROM0:2D15 C9 ret
0:2D16 (Set wC920 to 0, and?)
ROM0:2D16 F5 push af ROM0:2D17 3E 00 ld a,00 ;a = 0 ROM0:2D19 CD 0A 2D call 2D0A ;Set wC920 to 0 ROM0:2D1C CD 07 11 call 1107 ROM0:2D1F F1 pop af ROM0:2D20 C9 ret
0:2D21 (Set wC920 to 2, and?)
ROM0:2D21 F5 push af ROM0:2D22 3E 02 ld a,02 ;a = 2 ROM0:2D24 CD 0A 2D call 2D0A ;Set wC920 to 2 ROM0:2D27 CD 07 11 call 1107 ROM0:2D2A F1 pop af ROM0:2D2B C9 ret
0:2D2C (Set wC920 to 3, and?)
ROM0:2D2C F5 push af ROM0:2D2D 3E 03 ld a,03 ;a = 3 ROM0:2D2F CD 0A 2D call 2D0A ;Set wC920 to 3 ROM0:2D32 CD 07 11 call 1107 ROM0:2D35 F1 pop af ROM0:2D36 C9 ret
0:2D37 (Set wC920 to 4, and?)
ROM0:2D37 F5 push af ROM0:2D38 3E 04 ld a,04 ;a = 4 ROM0:2D3A CD 0A 2D call 2D0A ;Set wC920 to 4 ROM0:2D3D CD 07 11 call 1107 ROM0:2D40 F1 pop af ROM0:2D41 C9 ret
0:2D42 (Set wC920 to 5, and?)
ROM0:2D42 F5 push af ROM0:2D43 3E 05 ld a,05 ;a = 5 ROM0:2D45 CD 0A 2D call 2D0A ;Set wC920 to 5 ROM0:2D48 CD 07 11 call 1107 ROM0:2D4B F1 pop af ROM0:2D4C C9 ret
0:2D4D (Set wC920 to 6, and?)
ROM0:2D4D F5 push af ROM0:2D4E 3E 06 ld a,06 ;a = 6 ROM0:2D50 CD 0A 2D call 2D0A ;Set wC920 to 6 ROM0:2D53 CD 07 11 call 1107 ROM0:2D56 F1 pop af ROM0:2D57 C9 ret
0:2D58 (Set wC920 to 10, and?)
ROM0:2D58 F5 push af ROM0:2D59 3E 0A ld a,0A ;a = 10 ROM0:2D5B CD 0A 2D call 2D0A ;Set wC920 to 10 ROM0:2D5E CD 07 11 call 1107 ROM0:2D61 F1 pop af ROM0:2D62 C9 ret
0:2D63 (Set wC920 to 11, and?)
ROM0:2D63 F5 push af ROM0:2D64 3E 0B ld a,0B ;a = 11 ROM0:2D66 CD 0A 2D call 2D0A ;Set wC920 to 11 ROM0:2D69 CD 07 11 call 1107 ROM0:2D6C F1 pop af ROM0:2D6D C9 ret
0:2D6E (Set wC920 to 12, and?)
ROM0:2D6E F5 push af ROM0:2D6F 3E 0C ld a,0C ;a = 12 ROM0:2D71 CD 0A 2D call 2D0A ;Set wC920 to 12 ROM0:2D74 CD 07 11 call 1107 ROM0:2D77 F1 pop af ROM0:2D78 C9 ret
0:2D79 (Set wC920 to 13, and?)
ROM0:2D79 F5 push af ROM0:2D7A 3E 0D ld a,0D ;a = 13 ROM0:2D7C CD 0A 2D call 2D0A ;Set wC920 to 13 ROM0:2D7F CD 07 11 call 1107 ROM0:2D82 F1 pop af ROM0:2D83 C9 ret
0:2D84 (Set wC920 to 14, and?)
ROM0:2D84 F5 push af ROM0:2D85 3E 0E ld a,0E ;a = 14 ROM0:2D87 CD 0A 2D call 2D0A ;Set wC920 to 14 ROM0:2D8A CD 07 11 call 1107 ROM0:2D8D F1 pop af ROM0:2D8E C9 ret
0:2D8F (Set wC920 to 15, and?)
ROM0:2D8F F5 push af ROM0:2D90 3E 0F ld a,0F ;a = 15 ROM0:2D92 CD 0A 2D call 2D0A ;Set wC920 to 15 ROM0:2D95 CD 07 11 call 1107 ROM0:2D98 F1 pop af ROM0:2D99 C9 ret
0:2D9A (Set wC920 to 18, and?)
ROM0:2D9A F5 push af ROM0:2D9B 3E 12 ld a,12 ;a = 18 ROM0:2D9D CD 0A 2D call 2D0A ;Set wC920 to 18 ROM0:2DA0 CD 07 11 call 1107 ROM0:2DA3 F1 pop af ROM0:2DA4 C9 ret
0:2DA5 (Set wC920 to 16, and?)
ROM0:2DA5 F5 push af ROM0:2DA6 3E 10 ld a,10 ;a = 16 ROM0:2DA8 CD 0A 2D call 2D0A ;Set wC920 to 16 ROM0:2DAB CD 07 11 call 1107 ROM0:2DAE F1 pop af ROM0:2DAF C9 ret
0:2DB0 (Set wC920 to 7, and?)
ROM0:2DB0 F5 push af ROM0:2DB1 3E 07 ld a,07 ;a = 7 ROM0:2DB3 CD 0A 2D call 2D0A ;Set wC920 to 7 ROM0:2DB6 CD 07 11 call 1107 ROM0:2DB9 F1 pop af ROM0:2DBA C9 ret
0:2DBB (Set wC920 to 19, and?)
ROM0:2DBB F5 push af ROM0:2DBC 3E 13 ld a,13 ;a = 19 ROM0:2DBE CD 0A 2D call 2D0A ;Set wC920 to 19 ROM0:2DC1 CD 07 11 call 1107 ROM0:2DC4 F1 pop af ROM0:2DC5 C9 ret
0:2DC6 (Set wC920 to 1, and?)
ROM0:2DC6 F5 push af ROM0:2DC7 3E 01 ld a,01 ;a = 1 ROM0:2DC9 CD 0A 2D call 2D0A ;Set wC920 to 1 ROM0:2DCC CD 07 11 call 1107 ROM0:2DCF F1 pop af ROM0:2DD0 C9 ret
0:2DD (Set wC920 to 9, and?)1
ROM0:2DD1 F5 push af ROM0:2DD2 3E 09 ld a,09 ;a = 9 ROM0:2DD4 CD 0A 2D call 2D0A ;Set wC920 to 9 ROM0:2DD7 CD 07 11 call 1107 ROM0:2DDA F1 pop af ROM0:2DDB C9 ret
0:31F5 (sets (DD07) to 0)
- 0x31F5-0x31FC - Sets (DD07) to 0
ROM0:31F5 F5 push af ROM0:31F6 3E 00 ld a,00 ROM0:31F8 EA 07 DD ld (DD07),a ROM0:31FB F1 pop af ROM0:31FC C9 ret
0:31FD (sets (DD07) to 0 or 4)
- 0x31FD-0x3225 - Sets (DD07) to 0 or 4
ROM0:31FD F5 push af ROM0:31FE C5 push bc ROM0:31FF E5 push hl ROM0:3200 78 ld a,b ROM0:3201 FE 00 cp a,00 ROM0:3203 20 0C jr nz,3211 ROM0:3205 79 ld a,c ROM0:3206 FE 11 cp a,11 ROM0:3208 20 05 jr nz,320F ROM0:320A 3E 04 ld a,04 ROM0:320C EA 07 DD ld (DD07),a ROM0:320F 18 11 jr 3222 ROM0:3211 FA 07 DD ld a,(DD07) ROM0:3214 FE 04 cp a,04 ROM0:3216 28 0A jr z,3222 ROM0:3218 06 00 ld b,00 ROM0:321A 21 26 32 ld hl,3226 ROM0:321D 09 add hl,bc ROM0:321E 7E ld a,(hl) ROM0:321F EA 07 DD ld (DD07),a ROM0:3222 E1 pop hl ROM0:3223 C1 pop bc ROM0:3224 F1 pop af ROM0:3225 C9 ret
Bank 1
Initialize Cards in trunk
- 0x474F-0x4774 - Initialize the cards owned to 0, or 200 if debug game
ROM1:474F FE 00 cp a,00 ROM1:4751 20 04 jr nz,4757 // If debug, jump to 1:4757 ROM1:4753 3E FF ld a,FF ROM1:4755 18 02 jr 4759 // Else, jump to 1:4759 ROM1:4757 3E C8 ld a,C8 // If debug, gives the player 200 copies of each card ROM1:4759 06 02 ld b,02 ROM1:475B 0E 00 ld c,00 ROM1:475D 22 ldi (hl),a ROM1:475E 0D dec c ROM1:475F 20 FC jr nz,475D ROM1:4761 05 dec b ROM1:4762 20 F7 jr nz,475B ROM1:4764 0E D0 ld c,D0 ROM1:4766 22 ldi (hl),a ROM1:4767 0D dec c ROM1:4768 20 FC jr nz,4766 // Set (D5A0) to (D86F) to 0, or 200 if debug game ROM1:476A AF xor a ROM1:476B EA B7 D8 ld (D8B7),a // Set (D8B7) and (D8B8) to 0 ROM1:476E EA B8 D8 ld (D8B8),a ROM1:4771 E1 pop hl ROM1:4772 C1 pop bc ROM1:4773 F1 pop af ROM1:4774 C9 ret
1:4932
ROM1:4932 F5 push af
ROM1:4933 E5 push hl
ROM1:4934 E8 FE add sp,FE
ROM1:4936 F8 00 ld hl,sp+00
ROM1:4938 AF xor a
ROM1:4939 22 ldi (hl),a
ROM1:493A 22 ldi (hl),a
ROM1:493B 22 ldi (hl),a
ROM1:493C 01 00 00 ld bc,0000
ROM1:493F CF rst 08
03 09
ROM1:4942 FA 81 D9 ld a,(D981)
ROM1:4945 FE 14 cp a,14
ROM1:4947 30 23 jr nc,496C
ROM1:4949 CF rst 08
3D 05
ROM1:494C 5F ld e,a
ROM1:494D FA 83 D9 ld a,(D983)
ROM1:4950 BB cp e
ROM1:4951 28 02 jr z,4955
ROM1:4953 30 17 jr nc,496C
ROM1:4955 CD 75 47 call 4775
ROM1:4958 CD 18 48 call 4818
ROM1:495B FE FF cp a,FF
ROM1:495D 20 01 jr nz,4960
ROM1:495F AF xor a
ROM1:4960 F8 00 ld hl,sp+00
ROM1:4962 86 add (hl)
ROM1:4963 22 ldi (hl),a
ROM1:4964 3E 00 ld a,00
ROM1:4966 8E adc (hl)
ROM1:4967 22 ldi (hl),a
ROM1:4968 3E 00 ld a,00
ROM1:496A 8E adc (hl)
ROM1:496B 77 ld (hl),a
ROM1:496C 03 inc bc
ROM1:496D 11 D0 02 ld de,02D0
ROM1:4970 CD 98 1D call 1D98
ROM1:4973 FE 00 cp a,00
ROM1:4975 20 C8 jr nz,493F
ROM1:4977 F8 00 ld hl,sp+00
ROM1:4979 2A ldi a,(hl)
ROM1:497A 5F ld e,a
ROM1:497B 2A ldi a,(hl)
ROM1:497C 4F ld c,a
ROM1:497D 2A ldi a,(hl)
ROM1:497E 47 ld b,a
ROM1:497F E8 02 add sp,02
ROM1:4981 E1 pop hl
ROM1:4982 F1 pop af
ROM1:4983 C9 ret
Check if card is forbidden
ROM1:4984 C5 push bc ROM1:4985 D5 push de ROM1:4986 E5 push hl ROM1:4987 50 ld d,b ROM1:4988 59 ld e,c ROM1:4989 21 AD 49 ld hl,49AD ROM1:498C 2A ldi a,(hl) ROM1:498D 4F ld c,a ROM1:498E 2A ldi a,(hl) ROM1:498F 47 ld b,a ROM1:4990 CD 86 1D call 1D86 ROM1:4993 FE 01 cp a,01 ROM1:4995 20 04 jr nz,499B ROM1:4997 0E 00 ld c,00 ROM1:4999 18 0D jr 49A8 ROM1:499B CD 98 1D call 1D98 ROM1:499E FE 00 cp a,00 ROM1:49A0 20 04 jr nz,49A6 ROM1:49A2 0E 01 ld c,01 ROM1:49A4 18 02 jr 49A8 ROM1:49A6 18 E4 jr 498C ROM1:49A8 79 ld a,c ROM1:49A9 E1 pop hl ROM1:49AA D1 pop de ROM1:49AB C1 pop bc ROM1:49AC C9 ret
Forbidden cards array
ROM1:49AD 6B 01 - Black Luster Soldier 67 01 - Zera the Mant 63 01 - Super War-lion 6C 01 - Fiend's Mirror 7B 01 - Blue Eyes Ultimate Dragon 75 01 - Gate Guardian BC 02 - Performance of Swords BD 02 - Hungry Burger BE 02 - Sengenjin BF 02 - Skull Guardian C0 02 - Tri-Horned Dragon C1 02 - Serpent Night Dragon C5 02 - Crab Turtle CF 02 - Mask of Shine & Darkness C4 02 - Chakra CA 02 - Psycho-Puppet CC 02 - Javelin Beetle CB 02 - Garma Sword C3 02 - Cosmo Queen CE 02 - Dokurorider CD 02 - Fortress Whale C8 02 - Meteor Black Dragon D0 02 - ?
Graphics 1
- 0x5000-0x5B00 - Cursors
Checks Game Boy Color
ROM1:5BB3 F5 push af ROM1:5BB4 F0 DD ld a,(ff00+DD) ROM1:5BB6 FE 11 cp a,11 ROM1:5BB8 20 03 jr nz,5BBD // If(system ≠ GBC), get out of this function ROM1:5BBA CD D7 5B call 5BD7 ROM1:5BBD F1 pop af ROM1:5BBE C9 ret
Bank 2
2:4D8A
ROM2:4D8A F5 push af ROM2:4D8B CD 16 2D call 2D16 ROM2:4D8E 3E 04 ld a,04 ROM2:4D90 EA BF D9 ld (D9BF),a ROM2:4D93 3E 71 ld a,71 ROM2:4D95 EA C0 D9 ld (D9C0),a ROM2:4D98 CF rst 08 ROM2:4D99 03 inc bc ROM2:4D9A 06 CD ld b,CD ROM2:4D9C 6E ld l,(hl) ROM2:4D9D 2D dec l ROM2:4D9E CD B2 43 call 43B2 ROM2:4DA1 F1 pop af ROM2:4DA2 C9 ret
Bank 3
CPU Deck
Initialize CPU Deck
- 0xB24A-0xB263 - Initialize CPU Deck
ROM3:424A F5 push af ROM3:424B C5 push bc ROM3:424C E5 push hl ROM3:424D 3E 00 ld a,00 ROM3:424F EA 65 D9 ld (D965),a // Current card in CPU Deck is the first card ROM3:4252 21 15 D9 ld hl,D915 ROM3:4255 0E 28 ld c,28 ROM3:4257 3E D0 ld a,D0 ROM3:4259 22 ldi (hl),a ROM3:425A 3E 02 ld a,02 ROM3:425C 22 ldi (hl),a ROM3:425D 0D dec c ROM3:425E 20 F7 jr nz,4257 // Fills CPU deck with 0x2D0 (no card) ROM3:4260 E1 pop hl ROM3:4261 C1 pop bc ROM3:4262 F1 pop af ROM3:4263 C9 ret
Current card in CPU Deck
- 0xB264-0xB26E - Current card in CPU Deck
ROM3:4264 EA 65 D9 ld (D965),a // Current card in CPU Deck = accumulator ROM3:4267 C9 ret
ROM3:4268 F5 push af ROM3:4269 AF xor a ROM3:426A EA 65 D9 ld (D965),a // Current card in CPU Deck is the first card ROM3:426D F1 pop af ROM3:426E C9 ret
Remove card from CPU Deck
- 0xB26F-0xB286 - Delete the card CPU drew from its Deck
ROM3:426F F5 push af ROM3:4270 C5 push bc ROM3:4271 E5 push hl ROM3:4272 06 00 ld b,00 ROM3:4274 FA 65 D9 ld a,(D965) // Current card in CPU Deck ROM3:4277 4F ld c,a ROM3:4278 CB 21 sla c ROM3:427A 21 15 D9 ld hl,D915 ROM3:427D 09 add hl,bc ROM3:427E 3E D0 ld a,D0 ROM3:4280 22 ldi (hl),a ROM3:4281 36 02 ld (hl),02 // Replace card in deck by 0x2D0 (no card) ROM3:4283 E1 pop hl ROM3:4284 C1 pop bc ROM3:4285 F1 pop af ROM3:4286 C9 ret
CPU draw a card
- 0xB287-0xB29B - Read next card to be drawn by CPU
ROM3:4287 F5 push af ROM3:4288 E5 push hl ROM3:4289 06 00 ld b,00 ROM3:428B FA 65 D9 ld a,(D965) // Current card in CPU Deck ROM3:428E 4F ld c,a ROM3:428F CB 21 sla c ROM3:4291 21 15 D9 ld hl,D915 ROM3:4294 09 add hl,bc ROM3:4295 2A ldi a,(hl) ROM3:4296 4F ld c,a ROM3:4297 3A ldd a,(hl) // bc = card at (D915) + (cards drawn × 2) ROM3:4298 47 ld b,a ROM3:4299 E1 pop hl ROM3:429A F1 pop af ROM3:429B C9 ret
Increase pointer to card in CPU Deck
- 0xB29C-0xB2A9 - Increase pointer to card in CPU Deck
ROM3:429C F5 push af ROM3:429D FA 65 D9 ld a,(D965) // Current card in CPU Deck ROM3:42A0 FE 28 cp a,28 ROM3:42A2 30 04 jr nc,42A8 // If no more cards in CPU deck, get out of this function ROM3:42A4 3C inc a ROM3:42A5 EA 65 D9 ld (D965),a // (D965)++ ROM3:42A8 F1 pop af ROM3:42A9 C9 ret
Add card to CPU Deck
- 0xB2AA-0xB2BF - Add card to CPU Deck
ROM3:42AA F5 push af ROM3:42AB E5 push hl ROM3:42AC C5 push bc ROM3:42AD 06 00 ld b,00 ROM3:42AF FA 65 D9 ld a,(D965) // Current card in CPU Deck ROM3:42B2 4F ld c,a ROM3:42B3 CB 21 sla c ROM3:42B5 21 15 D9 ld hl,D915 ROM3:42B8 09 add hl,bc ROM3:42B9 C1 pop bc // Card to add in CPU Deck ROM3:42BA 79 ld a,c ROM3:42BB 22 ldi (hl),a ROM3:42BC 70 ld (hl),b // Add card to CPU Deck ROM3:42BD E1 pop hl ROM3:42BE F1 pop af ROM3:42BF C9 ret
CPU Draw Phase
- 0xB2AA-0xB2BF - Probably the whole CPU Draw Phase
ROM3:42C0 F5 push af ROM3:42C1 C5 push bc ROM3:42C2 47 ld b,a ROM3:42C3 CD 65 4C call 4C65 ROM3:42C6 FE 00 cp a,00 ROM3:42C8 28 26 jr z,42F0 ROM3:42CA FA 65 D9 ld a,(D965) // Current card in CPU Deck ROM3:42CD FE 28 cp a,28 ROM3:42CF 30 1F jr nc,42F0 // If the CPU has no card left in its deck, get out of this function ROM3:42D1 0E 00 ld c,00 ROM3:42D3 CD E4 1C call 1CE4 ROM3:42D6 CD 87 42 call 4287 // CPU draw a card ROM3:42D9 CD 6F 42 call 426F // Remove card from CPU Deck ROM3:42DC CD 9C 42 call 429C // Increase pointer to card in CPU Deck ROM3:42DF 79 ld a,c ROM3:42E0 EA 6D DA ld (DA6D),a ROM3:42E3 78 ld a,b ROM3:42E4 EA 6E DA ld (DA6E),a ROM3:42E7 CD C5 21 call 21C5 ROM3:42EA CD 77 21 call 2177 ROM3:42ED CD 3F 1D call 1D3F ROM3:42F0 C1 pop bc ROM3:42F1 F1 pop af ROM3:42F2 C9 ret
3:42F3 (to document)
- 0xB2F3-0xB306 - ?
ROM3:42F3 F5 push af ROM3:42F4 C5 push bc ROM3:42F5 CD 68 42 call 4268 // Current card in CPU Deck is the first card ROM3:42F8 06 00 ld b,00 ROM3:42FA 0E 05 ld c,05 ROM3:42FC 78 ld a,b ROM3:42FD CD C0 42 call 42C0 ROM3:4300 04 inc b ROM3:4301 0D dec c ROM3:4302 20 F8 jr nz,42FC ROM3:4304 C1 pop bc ROM3:4305 F1 pop af ROM3:4306 C9 ret
3:447F (to document)
- 0xB47F-0xB482 - Stores ? in (DA22)
ROM3:447F EA 22 DA ld (DA22),a ROM3:4482 C9 ret
3:4483 (set DA22 to 0)
- 0xB483-0xB489 - ?
ROM3:4483 F5 push af ROM3:4484 AF xor a ROM3:4485 EA 22 DA ld (DA22),a // (DA22) = 0 ROM3:4488 F1 pop af ROM3:4489 C9 ret
3:448A (to document)
- 0xB48A-0xB4A1 - ?
ROM3:448A F5 push af ROM3:448B C5 push bc ROM3:448C E5 push hl ROM3:448D 06 00 ld b,00 ROM3:448F FA 22 DA ld a,(DA22) ROM3:4492 4F ld c,a ROM3:4493 CB 21 sla c ROM3:4495 21 D2 D9 ld hl,D9D2 ROM3:4498 09 add hl,bc ROM3:4499 3E D0 ld a,D0 ROM3:449B 22 ldi (hl),a ROM3:449C 36 02 ld (hl),02 ROM3:449E E1 pop hl ROM3:449F C1 pop bc ROM3:44A0 F1 pop af ROM3:44A1 C9 ret
3:44A2 (to document)
- 0xB4A2-0xB4B5 - ?
ROM3:44A2 F5 push af ROM3:44A3 E5 push hl ROM3:44A4 06 00 ld b,00 ROM3:44A6 FA 22 DA ld a,(DA22) ROM3:44A9 4F ld c,a ROM3:44AA CB 21 sla c ROM3:44AC 21 D2 D9 ld hl,D9D2 ROM3:44AF 09 add hl,bc // hl = D9D2 + ((DA22) × 2) ROM3:44B0 2A ldi a,(hl) ROM3:44B1 4F ld c,a ROM3:44B2 46 ld b,(hl) // Loads card ID (or 0x2D0 if no card) ROM3:44B3 E1 pop hl ROM3:44B4 F1 pop af ROM3:44B5 C9 ret
3:59EC (to document)
- 0xC9EC-0xC9F3 - ?
ROM3:59EC FA 1C DB ld a,(DB1C) ROM3:59EF 57 ld d,a ROM3:59F0 CD 04 5A call 5A04 ROM3:59F3 CF rst 08
3:5A04 (to document)
- 0xCA04-0xCA25 - ?
ROM3:5A04 F5 push af ROM3:5A05 C5 push bc ROM3:5A06 D5 push de ROM3:5A07 E5 push hl ROM3:5A08 5F ld e,a ROM3:5A09 7B ld a,e ROM3:5A0A CD 7F 44 call 447F ROM3:5A0D CD A2 44 call 44A2 ROM3:5A10 CD 86 1D call 1D86 // Checks if Card ID is 721 ROM3:5A13 FE 01 cp a,01 ROM3:5A15 28 0A jr z,5A21 // If(bc == 721), get out of this function ROM3:5A17 1C inc e ROM3:5A18 7B ld a,e ROM3:5A19 FE 28 cp a,28 ROM3:5A1B 20 02 jr nz,5A1F ROM3:5A1D 1E 00 ld e,00 ROM3:5A1F 18 E8 jr 5A09 ROM3:5A21 E1 pop hl ROM3:5A22 D1 pop de ROM3:5A23 C1 pop bc ROM3:5A24 F1 pop af ROM3:5A25 C9 ret
Bank 4
rst 08 pointers
- 0x10002-0x10027 - Pointers used by function 0:11D5
ROM4:4002 28 40 7E 40 1E 4A 3A 4A - Save file sanity check BC 4A - Save after a Duel D2 4A D5 4B - Normal New Game E8 4B - Debug New Game 2B 4A - Enable MBC2 RAM 33 4A - Disable MBC2 RAM FB 4B - Enables Debug 0F 44 - ? 59 4D 6A 4F A1 58 BE 58 08 5A E4 59 48 5A
Main Menu
Main Menu handler
- 0x1017F-0x101A7 - Main Menu handler
ROM4:417F C5 push bc ROM4:4180 E5 push hl ROM4:4181 3E 04 ld a,04 ROM4:4183 CD 16 0F call 0F16 ROM4:4186 CD AC 42 call 42AC // Branch to selected Menu ROM4:4189 CD 9A 10 call 109A ROM4:418C CD 07 11 call 1107 ROM4:418F 06 00 ld b,00 ROM4:4191 FA 1D DB ld a,(DB1D) ROM4:4194 4F ld c,a ROM4:4195 CB 21 sla c ROM4:4197 21 A8 41 ld hl,41A8 ROM4:419A 09 add hl,bc ROM4:419B 2A ldi a,(hl) ROM4:419C 66 ld h,(hl) ROM4:419D 6F ld l,a ROM4:419E 01 A3 41 ld bc,41A3 ROM4:41A1 C5 push bc ROM4:41A2 E9 jp hl ROM4:41A3 3E 01 ld a,01 ROM4:41A5 E1 pop hl ROM4:41A6 C1 pop bc ROM4:41A7 C9 ret
Updates Menu ID
- 0x10271-0x10283 - Updates Menu ID in Main Menu
ROM4:4271 3E 04 ld a,04 ROM4:4273 CD 16 0F call 0F16 ROM4:4276 CD 8D 42 call 428D ROM4:4279 CD AC 42 call 42AC ROM4:427C CD 9A 10 call 109A ROM4:427F CD 07 11 call 1107 ROM4:4282 AF xor a ROM4:4283 C9 ret
Initializes Menu ID
- 0x10284-0x1028A - Initializes Menu ID to 0
ROM4:4284 F5 push af ROM4:4285 AF xor a ROM4:4286 EA 1D DB ld (DB1D),a ROM4:4289 F1 pop af ROM4:428A C9 ret
Increment Menu ID
- 0x1028D-0x1029B - Menu ID + 1
ROM4:428D F5 push af ROM4:428E FA 1D DB ld a,(DB1D) ROM4:4291 3C inc a ROM4:4292 FE 06 cp a,06 ROM4:4294 20 01 jr nz,4297 ROM4:4296 AF xor a ROM4:4297 EA 1D DB ld (DB1D),a ROM4:429A F1 pop af ROM4:429B C9 ret
Decrement Menu ID
- 0x1029C-0x102AB - Menu ID - 1
ROM4:429C F5 push af ROM4:429D FA 1D DB ld a,(DB1D) ROM4:42A0 3D dec a ROM4:42A1 FE FF cp a,FF ROM4:42A3 20 02 jr nz,42A7 ROM4:42A5 3E 05 ld a,05 ROM4:42A7 EA 1D DB ld (DB1D),a ROM4:42AA F1 pop af ROM4:42AB C9 ret
Branch to selected Menu
- 0x102AC-0x102C1 - Branch to specific instructions for selected Menu ID
ROM4:42AC F5 push af ROM4:42AD C5 push bc ROM4:42AE D5 push de ROM4:42AF E5 push hl ROM4:42B0 FA 1D DB ld a,(DB1D) ROM4:42B3 CD C2 42 call 42C2 ROM4:42B6 79 ld a,c ROM4:42B7 11 02 00 ld de,0002 ROM4:42BA CD BE 13 call 13BE ROM4:42BD E1 pop hl ROM4:42BE D1 pop de ROM4:42BF C1 pop bc ROM4:42C0 F1 pop af ROM4:42C1 C9 ret
Load data of selected Menu ID
- 0x102C2-0x102D2 - Load array corresponding to Menu ID
ROM4:42C2 F5 push af ROM4:42C3 E5 push hl ROM4:42C4 06 00 ld b,00 ROM4:42C6 4F ld c,a ROM4:42C7 CB 21 sla c ROM4:42C9 21 D3 42 ld hl,42D3 ROM4:42CC 09 add hl,bc // hl = 0x42D3 + (Menu ID × 2) ROM4:42CD 2A ldi a,(hl) ROM4:42CE 47 ld b,a ROM4:42CF 4E ld c,(hl) ROM4:42D0 E1 pop hl ROM4:42D1 F1 pop af ROM4:42D2 C9 ret
Menus pointers
- 0x102D3-0x102E2 - Menus pointers array
ROM4:42D3 50 26 - Campaign 74 3B - Versus 73 62 - Trade 51 78 - Records 2E 62 - Change Name 2D 3B - Password F5 C5 - Sound Test 0E 01 - Character Viewer
SRAM management
4:4403 (to document)
- 0x10403-0x10407 - Calls 4:440F, then rst 08
ROM4:4403 F5 push af ROM4:4404 CD 0F 44 call 440F ROM4:4407 CF rst 08
- 0x1040F-0x1041E - ?
ROM4:440F C5 push bc ROM4:4410 E5 push hl ROM4:4411 06 00 ld b,00 ROM4:4413 CD 08 5A call 5A08 // Load Stage 5 opponent ID ROM4:4416 4F ld c,a ROM4:4417 21 1F 44 ld hl,441F ROM4:441A 09 add hl,bc ROM4:441B 7E ld a,(hl) ROM4:441C E1 pop hl ROM4:441D C1 pop bc ROM4:441E C9 ret
- 0x1041F-0x10422 - Array ?
ROM4:441F 14 15 16 17
Enable MBC2 RAM
- 0x10A2B-0x10A32 - Enable MBC2 battery RAM
ROM4:4A2B F5 push af ROM4:4A2C 3E 0A ld a,0A ROM4:4A2E EA 00 00 ld (0000),a ROM4:4A31 F1 pop af ROM4:4A32 C9 ret
Disable MBC2 RAM
- 0x10A33-0x10A39 - Disable MBC2 battery RAM
ROM4:4A33 F5 push af ROM4:4A34 AF xor a ROM4:4A35 EA 00 00 ld (0000),a ROM4:4A38 F1 pop af ROM4:4A39 C9 ret
Save file sanity check
- 0x10A3A-0x10A74 - Save file sanity check, creates a new save file if the current save is corrupted
ROM4:4A3A F5 push af ROM4:4A3B CD 2B 4A call 4A2B // Enable MBC2 RAM ROM4:4A3E FA FF B7 ld a,(B7FF) // Debug ROM4:4A41 EA 96 DB ld (DB96),a // Copies Debug value to (DB96) ROM4:4A44 3E 00 ld a,00 ROM4:4A46 EA 98 DB ld (DB98),a // (DB98) = 0 ROM4:4A49 CD 6F 4C call 4C6F // SRAM KONAMI check ROM4:4A4C FE 01 cp a,01 ROM4:4A4E 20 0B jr nz,4A5B // If the « KONAMI » string is correct, jump to 4:4A5B ROM4:4A50 CD 73 50 call 5073 // Name Input screen ROM4:4A53 CD 75 4A call 4A75 // Erase SRAM and create a new Save File ROM4:4A56 3E 01 ld a,01 ROM4:4A58 EA 98 DB ld (DB98),a // (DB98) = 1 ROM4:4A5B CD 93 4B call 4B93 // Check SRAM Block and Checksum ROM4:4A5E FE 01 cp a,01 ROM4:4A60 20 0B jr nz,4A6D // If the save file is not corrupted, jump to 4:4A6D ROM4:4A62 CD 73 50 call 5073 // Name Input screen ROM4:4A65 CD 75 4A call 4A75 // Erase SRAM and create a new Save File ROM4:4A68 3E 01 ld a,01 ROM4:4A6A EA 98 DB ld (DB98),a // (DB98) = 1 ROM4:4A6D CD E2 4A call 4AE2 // Clones SRAM if SRAM block 2 ROM4:4A70 CD 33 4A call 4A33 // Disable MBC2 RAM ROM4:4A73 F1 pop af ROM4:4A74 C9 ret
New Save file
- 0x10A3A-0x10A74 - Creates a new Save file
ROM4:4A75 CD 8E 4A call 4A8E // Erases save file ROM4:4A78 CD A6 4A call 4AA6 // Blanks (B800) to (BFFF), set Stage 5 opponent and (FFDB) to a PRN ROM4:4A7B CD 4D 4C call 4C4D ROM4:4A7E CD 13 4C call 4C13 // SRAM Block 1 ROM4:4A81 CD 8C 4C call 4C8C // Copy Data in SRAM ROM4:4A84 CD 20 4C call 4C20 // SRAM Block 1 ROM4:4A87 CD EF 4A call 4AEF // Clones SRAM ROM4:4A8A CD 06 4C call 4C06 // SRAM write successful ! ROM4:4A8D C9 ret
Blanks SRAM
- 0x10A8E-0x10AA5 - 00s SRAM area (A000) to (BFFF)
ROM4:4A8E F5 push af ROM4:4A8F C5 push bc ROM4:4A90 D5 push de ROM4:4A91 E5 push hl ROM4:4A92 21 00 A0 ld hl,A000 ROM4:4A95 AF xor a ROM4:4A96 06 20 ld b,20 ROM4:4A98 0E 00 ld c,00 ROM4:4A9A 22 ldi (hl),a ROM4:4A9B 0D dec c ROM4:4A9C 20 FC jr nz,4A9A ROM4:4A9E 05 dec b ROM4:4A9F 20 F7 jr nz,4A98 ROM4:4AA1 E1 pop hl ROM4:4AA2 D1 pop de ROM4:4AA3 C1 pop bc ROM4:4AA4 F1 pop af ROM4:4AA5 C9 ret
- 0x10AA6-0x10AB5 - Calls 4:5866, then rst 08
ROM4:4AA6 CD 66 58 call 5866 // Blanks (B800) to (BFFF), set Stage 5 opponent and (FFDB) to a PRN ROM4:4AA9 CF rst 08
Save after a Duel
- 0x10ABC-0x10AD1 - Save after a Duel
ROM4:4ABC CD 2B 4A call 4A2B // Enable MBC2 RAM ROM4:4ABF CD 13 4C call 4C13 // SRAM Block 1 ROM4:4AC2 CD 8C 4C call 4C8C // Copy Data in SRAM ROM4:4AC5 CD 20 4C call 4C20 // SRAM Block 2 ROM4:4AC8 CD EF 4A call 4AEF // Clones SRAM ROM4:4ACB CD 06 4C call 4C06 // SRAM block 0 ROM4:4ACE CD 33 4A call 4A33 // Disable MBC2 RAM ROM4:4AD1 C9 ret
Save after Deck change
- 0x10ABC-0x10AD1 -
ROM4:4AD2 CD 2B 4A call 4A2B // Enable MBC2 RAM ROM4:4AD5 CD 06 4C call 4C06 // SRAM Block 0 ROM4:4AD8 CD 13 4B call 4C13 // SRAM Block 1 ROM4:4ADB CD BA 4C call 4CBA ROM4:4ADE CD 33 4A call 4A33 // Disable MBC2 RAM ROM4:4AE1 C9 ret
Clones SRAM
- 0x10AE2-0x10AEE - Checks SRAM block, and clones it if it's a temporary block
ROM4:4AE2 F5 push af ROM4:4AE3 FA F0 B7 ld a,(B7F0) ROM4:4AE6 FE 02 cp a,02 ROM4:4AE8 20 03 jr nz,4AED // If(SRAM block ≠ 2), jump to 4:4AED ROM4:4AEA CD EF 4A call 4AEF // Clones SRAM ROM4:4AED F1 pop af ROM4:4AEE C9 ret
- 0x10AEF-0x10B12 - Clones SRAM 0xA000-0xABF8
ROM4:4AEF F5 push af ROM4:4AF0 C5 push bc ROM4:4AF1 D5 push de ROM4:4AF2 E5 push hl ROM4:4AF3 21 00 A0 ld hl,A000 ROM4:4AF6 11 F8 AB ld de,ABF8 ROM4:4AF9 0E F8 ld c,F8 ROM4:4AFB 2A ldi a,(hl) ROM4:4AFC 12 ld (de),a ROM4:4AFD 13 inc de ROM4:4AFE 0D dec c ROM4:4AFF 20 FA jr nz,4AFB ROM4:4B01 06 0B ld b,0B ROM4:4B03 0E 00 ld c,00 ROM4:4B05 2A ldi a,(hl) ROM4:4B06 12 ld (de),a ROM4:4B07 13 inc de ROM4:4B08 0D dec c ROM4:4B09 20 FA jr nz,4B05 ROM4:4B0B 05 dec b ROM4:4B0C 20 F5 jr nz,4B03 ROM4:4B0E E1 pop hl ROM4:4B0F D1 pop de ROM4:4B10 C1 pop bc ROM4:4B11 F1 pop af ROM4:4B12 C9 ret
SRAM checksum pointers
- 0x10B55-0x10B58 - SRAM checksum pointers array
ROM4:4B57 F6 AB EE B7
SRAM Checksum calculation
- 0x10B59-0x10B8E - Calculate SRAM checksum
ROM4:4B59 F5 push af ROM4:4B5A C5 push bc ROM4:4B5B E5 push hl ROM4:4B5C 06 00 ld b,00 ROM4:4B5E FA 97 DB ld a,(DB97) ROM4:4B61 4F ld c,a ROM4:4B62 CB 21 sla c ROM4:4B64 21 8F 4B ld hl,4B8F ROM4:4B67 09 add hl,bc // hl = 0x4B8F + (Save file block × 2) ROM4:4B68 2A ldi a,(hl) ROM4:4B69 66 ld h,(hl) ROM4:4B6A 6F ld l,a // hl = Save file block pointer ROM4:4B6B 11 00 00 ld de,0000 ROM4:4B6E 0E F6 ld c,F6 ROM4:4B70 2A ldi a,(hl) // Add every byte of the SRAM block ROM4:4B71 83 add e ROM4:4B72 5F ld e,a ROM4:4B73 3E 00 ld a,00 ROM4:4B75 8A adc d ROM4:4B76 57 ld d,a ROM4:4B77 0D dec c ROM4:4B78 20 F6 jr nz,4B70 ROM4:4B7A 06 0B ld b,0B ROM4:4B7C 0E 00 ld c,00 ROM4:4B7E 2A ldi a,(hl) ROM4:4B7F 83 add e ROM4:4B80 5F ld e,a ROM4:4B81 3E 00 ld a,00 ROM4:4B83 8A adc d ROM4:4B84 57 ld d,a ROM4:4B85 0D dec c ROM4:4B86 20 F6 jr nz,4B7E ROM4:4B88 05 dec b ROM4:4B89 20 F1 jr nz,4B7C // Loop until it's finished ROM4:4B8B E1 pop hl ROM4:4B8C C1 pop bc ROM4:4B8D F1 pop af ROM4:4B8E C9 ret
SRAM blocks pointers
- 0x10B8F-0x10B92 - SRAM blocks pointers array
ROM4:4B8F 00 A0 - Block 1 F8 AB - Block 2
SRAM Block and Checksum check
- 0x10AEF-0x10B12 - Save file sanity check
ROM4:4B93 C5 push bc ROM4:4B94 D5 push de ROM4:4B95 E5 push hl ROM4:4B96 FA F0 B7 ld a,(B7F0) // SRAM block ROM4:4B99 FE 03 cp a,03 ROM4:4B9B 38 04 jr c,4BA1 // If the SRAM block is valid, jump to 4:4BA1 ROM4:4B9D 3E 01 ld a,01 // Else, flag the save file as corrupted... ROM4:4B9F 18 2D jr 4BCE // ...and get out of this function ROM4:4BA1 06 00 ld b,00 ROM4:4BA3 FA F0 B7 ld a,(B7F0) ROM4:4BA6 4F ld c,a ROM4:4BA7 21 D2 4B ld hl,4BD2 ROM4:4BAA 09 add hl,bc // hl = 0x4BD2 + SRAM block ROM4:4BAB 7E ld a,(hl) ROM4:4BAC EA 97 DB ld (DB97),a // (DB97) = Save file block ROM4:4BAF CD 59 4B call 4B59 // de = SRAM Checksum ROM4:4BB2 06 00 ld b,00 ROM4:4BB4 FA 97 DB ld a,(DB97) ROM4:4BB7 4F ld c,a ROM4:4BB8 CB 21 sla c ROM4:4BBA 21 55 4B ld hl,4B55 ROM4:4BBD 09 add hl,bc // hl = 0x4B55 + (Save file block × 2) ROM4:4BBE 2A ldi a,(hl) ROM4:4BBF 66 ld h,(hl) ROM4:4BC0 6F ld l,a ROM4:4BC1 2A ldi a,(hl) ROM4:4BC2 BB cp e ROM4:4BC3 28 02 jr z,4BC7 ROM4:4BC5 06 01 ld b,01 // If the checksum is invalid, flag the save file as corrupted ROM4:4BC7 7E ld a,(hl) ROM4:4BC8 BA cp d ROM4:4BC9 28 02 jr z,4BCD ROM4:4BCB 06 01 ld b,01 // If the checksum is invalid, flag the save file as corrupted ROM4:4BCD 78 ld a,b ROM4:4BCE E1 pop hl ROM4:4BCF D1 pop de ROM4:4BD0 C1 pop bc ROM4:4BD1 C9 ret
- 0x10BD2-0x10BD5 - Save file blocks array
ROM4:4BD2 01 01 00
Normal New Game
- 0x10BD5-0x10BE7 - Normal New Game
ROM4:4BD5 F5 push af ROM4:4BD6 CD 2B 4A call 4A2B // Enable MBC2 RAM ROM4:4BD9 3E AA ld a,AA ROM4:4BDB EA F1 B7 ld (B7F1),a ROM4:4BDE 3E 00 ld a,00 ROM4:4BE0 EA FF B7 ld (B7FF),a // No debug ROM4:4BE3 CD 33 4A call 4A33 // Disable MBC2 RAM ROM4:4BE6 F1 pop af ROM4:4BE7 C9 ret
Debug New Game
- 0x10BD5-0x10BE7 - Debug New Game
ROM4:4BE8 F5 push af ROM4:4BE9 CD 2B 4A call 4A2B // Enable MBC2 RAM ROM4:4BEC 3E AA ld a,AA ROM4:4BEE EA F1 B7 ld (B7F1),a ROM4:4BF1 3E 01 ld a,01 ROM4:4BF3 EA FF B7 ld (B7FF),a // Debug ROM4:4BF6 CD 33 4A call 4A33 // Disable MBC2 RAM ROM4:4BF9 F1 pop af ROM4:4BFA C9 ret
- 0x10BFB-0x10C05 - Enables Debug features if RAM 0xDB96 ≠ 0 (copy from SRAM 0xB7FF), and the xor a is removed
ROM4:4BFB FA 96 DB ld a,(DB96) ROM4:4BFE FE 00 cp a,00 ROM4:4C00 28 02 jr z,4C04 ROM4:4C02 3E 01 ld a,01 ROM4:4C04 AF xor a ROM4:4C05 C9 ret
SRAM blocks
- 0x10C06-0x10C12 - Writes 0x00 to SRAM 0xB7F0, writes 0x00 to WRAM 0xDB97
ROM4:4C06 F5 push af ROM4:4C07 3E 00 ld a,00 ROM4:4C09 EA F0 B7 ld (B7F0),a ROM4:4C0C 3E 00 ld a,00 ROM4:4C0E EA 97 DB ld (DB97),a ROM4:4C11 F1 pop af ROM4:4C12 C9 ret
- 0x10C13-0x10C1F - Writes 0x01 to SRAM 0xB7F0, writes 0x00 to WRAM 0xDB97
ROM4:4C13 F5 push af ROM4:4C14 3E 01 ld a,01 ROM4:4C16 EA F0 B7 ld (B7F0),a ROM4:4C19 3E 00 ld a,00 ROM4:4C1B EA 97 DB ld (DB97),a ROM4:4C1E F1 pop af ROM4:4C1F C9 ret
- 0x10C20-0x10C2C - Writes 0x02 to SRAM 0xB7F0, writes 0x01 to WRAM 0xDB97
ROM4:4C20 F5 push af ROM4:4C21 3E 02 ld a,02 ROM4:4C23 EA F0 B7 ld (B7F0),a ROM4:4C26 3E 01 ld a,01 ROM4:4C28 EA 97 DB ld (DB97),a ROM4:4C2B F1 pop af ROM4:4C2C C9 ret
SRAM KONAMI check
- 0x10C64-0x10C6E - Date of build and « KONAMI » string used to check SRAM existence in function 4:4C6F.
ROM4:4C64 99 04 11 00 02 4B 4F 4E 41 4D 49 April 11, 1999 - KONAMI
- 0x10C6F-0x10C8B - Control the presence of date of build and « KONAMI » string in SRAM at 0xB7F1-0xB7FB, to determine if save data exists.
ROM4:4C6F C5 push bc ROM4:4C70 D5 push de ROM4:4C71 E5 push hl ROM4:4C72 06 00 ld b,00 ROM4:4C74 21 F1 B7 ld hl,B7F1 ROM4:4C77 11 64 4C ld de,4C64 ROM4:4C7A 0E 0B ld c,0B ROM4:4C7C 1A ld a,(de) ROM4:4C7D BE cp (hl) ROM4:4C7E 28 02 jr z,4C82 // If the current character is ok, jump to 4:4CB2 ROM4:4C80 06 01 ld b,01 // Else b = 1 ROM4:4C82 23 inc hl ROM4:4C83 13 inc de ROM4:4C84 0D dec c ROM4:4C85 20 F5 jr nz,4C7C // Loops 11 times to see if « 99 04 11 KONAMI » is present in SRAM at (B7F1)-(B7FB). ROM4:4C87 78 ld a,b ROM4:4C88 E1 pop hl ROM4:4C89 D1 pop de ROM4:4C8A C1 pop bc ROM4:4C8B C9 ret
Copy data to SRAM after a Duel
- 0x10C8C-0x10CB9 - Copy various data in SRAM, including Stage 5 opponent
ROM4:4C8C F5 push af ROM4:4C8D C5 push bc ROM4:4C8E D5 push de ROM4:4C8F E5 push hl ROM4:4C90 11 00 A0 ld de,A000 ROM4:4C93 01 E5 4C ld bc,4CE5 ROM4:4C96 0A ld a,(bc) ROM4:4C97 6F ld l,a ROM4:4C98 03 inc bc ROM4:4C99 0A ld a,(bc) ROM4:4C9A 67 ld h,a // Load RAM pointer from 4:4CE5 ROM4:4C9B 03 inc bc ROM4:4C9C FE 00 cp a,00 ROM4:4C9E 20 05 jr nz,4CA5 ROM4:4CA0 7D ld a,l ROM4:4CA1 FE 00 cp a,00 ROM4:4CA3 28 0D jr z,4CB2 // If there's no more data to be saved, jump to 4:4CB2 ROM4:4CA5 C5 push bc ROM4:4CA6 0A ld a,(bc) ROM4:4CA7 4F ld c,a // Load # of bytes to be read ROM4:4CA8 2A ldi a,(hl) // Load data at RAM pointer ROM4:4CA9 12 ld (de),a // ... And write it to SRAM ROM4:4CAA 13 inc de ROM4:4CAB 0D dec c ROM4:4CAC 20 FA jr nz,4CA8 // If there's still data to be retrieved from RAM, loop to 4:4AC8 ROM4:4CAE C1 pop bc ROM4:4CAF 03 inc bc ROM4:4CB0 18 E4 jr 4C96 // Jump to 4:4C96 (next data to be copied to SRAM) ROM4:4CB2 CD 37 4B call 4B37 ROM4:4CB5 E1 pop hl ROM4:4CB6 D1 pop de ROM4:4CB7 C1 pop bc ROM4:4CB8 F1 pop af ROM4:4CB9 C9 ret
Copy data to SRAM after a Deck change
- 0x10CBA-0x10CE4 - Copy various data in SRAM
ROM4:4CBA F5 push af ROM4:4CBB C5 push bc ROM4:4CBC D5 push de ROM4:4CBD E5 push hl ROM4:4CBE 11 00 A0 ld de,A000 ROM4:4CC1 01 E5 4C ld bc,4CE5 ROM4:4CC4 0A ld a,(bc) ROM4:4CC5 6F ld l,a ROM4:4CC6 03 inc bc ROM4:4CC7 0A ld a,(bc) ROM4:4CC8 67 ld h,a ROM4:4CC9 03 inc bc ROM4:4CCA FE 00 cp a,00 ROM4:4CCC 20 05 jr nz,4CD3 ROM4:4CCE 7D ld a,l ROM4:4CCF FE 00 cp a,00 ROM4:4CD1 28 0D jr z,4CE0 ROM4:4CD3 C5 push bc ROM4:4CD4 0A ld a,(bc) ROM4:4CD5 4F ld c,a ROM4:4CD6 1A ld a,(de) ROM4:4CD7 22 ldi (hl),a ROM4:4CD8 13 inc de ROM4:4CD9 0D dec c ROM4:4CDA 20 FA jr nz,4CD6 ROM4:4CDC C1 pop bc ROM4:4CDD 03 inc bc ROM4:4CDE 18 E4 jr 4CC4 ROM4:4CE0 E1 pop hl ROM4:4CE1 D1 pop de ROM4:4CE2 C1 pop bc ROM4:4CE3 F1 pop af ROM4:4CE4 C9 ret
WRAM and HRAM pointers
- 0x10CE5-0x10D1F - RAM pointers
ROM4:4CE5 16 DB 04 - PRNG, 4 bytes 47 DC 04 - (DC47), 4 bytes DC FF 01 - Stage 5 opponent, 1 byte DB FF 01 - (FFDB), 1 byte 4F DC 01 - (DC4F), 1 byte C5 D8 50 - Player's Deck, 80 bytes A0 D5 C8 - Cards in trunk, 720 bytes 68 D6 C8 - ... 30 D7 C8 - ... F8 D7 78 - ... CF DB 2C - Duel Records, 44 bytes FB DB 2C - Wins Records, 44 bytes 30 DC 08 - (DC30), 8 bytes 00 B8 C8 - (B800), 200 bytes C8 B8 C8 - (B8C8), 200 bytes 90 B9 C8 - (B990), 200 bytes 58 BA C8 - (BA58), 200 bytes 1B DD 5A - (DD1B), 90 bytes D9 FF 02 - Deck Capacity, 2 bytes
Call Name Input screen
- 0x11073-0x11076 - a = 0x0A, then rst 08 to the Name Input screen
ROM4:5073 F5 push af ROM4:5074 3E 0A ld a,0A ROM4:5076 CF rst 08 // Continue to 3B:4004 (Name Input screen)
- 0x11077-0x11078 - Pointer to 3B:4003
ROM4:5077 03 3B
Blanks SRAM (B800), set (FFDB) (FFDC)
- 0x11866-0x118A0 - Blanks (B800) to (BFFF), set Stage 5 opponent and (FFDB) to a Pseudo-Random Number
ROM4:5866 F5 push af ROM4:5867 C5 push bc ROM4:5868 D5 push de ROM4:5869 E5 push hl ROM4:586A 21 16 DB ld hl,DB16 ROM4:586D 11 47 DC ld de,DC47 ROM4:5870 0E 04 ld c,04 ROM4:5872 2A ldi a,(hl) ROM4:5873 12 ld (de),a ROM4:5874 13 inc de ROM4:5875 0D dec c ROM4:5876 20 FA jr nz,5872 ROM4:5878 21 00 B8 ld hl,B800 ROM4:587B AF xor a ROM4:587C 06 04 ld b,04 ROM4:587E 0E C8 ld c,C8 ROM4:5880 22 ldi (hl),a // Blanks (B800) to (BFFF) ROM4:5881 0D dec c ROM4:5882 20 FC jr nz,5880 ROM4:5884 05 dec b // Loop 800 times ROM4:5885 20 F7 jr nz,587E ROM4:5887 AF xor a ROM4:5888 EA 4F DC ld (DC4F),a // (DC4F) = 0 ROM4:588B FA 48 DC ld a,(DC48) // a = PRN ROM4:588E E6 03 and a,03 ROM4:5890 E0 DC ld (ff00+DC),a // Stage 5 opponent = a ROM4:5892 CD DB 20 call 20DB // PRNG ROM4:5895 FA 1C DB ld a,(DB1C) ROM4:5898 E6 07 and a,07 ROM4:589A E0 DB ld (ff00+DB),a ROM4:589C E1 pop hl ROM4:589D D1 pop de ROM4:589E C1 pop bc ROM4:589F F1 pop af ROM4:58A0 C9 ret
Stage 5 opponent
Loads Stage 5 opponent ID
- 0x11A08-0x11A0C - Loads the Stage 5 opponent ID
ROM4:5A08 F0 DC ld a,(ff00+DC) ROM4:5A0A E6 03 and a,03 ROM4:5A0C C9 ret
Changes Stage 5 opponent
- 0x11A0D-0x11A47 - Calls PRNG to determine if the Stage 5 opponent changes
3/4096 chance to change Stage 5 opponent after each duel: 1/256, then 1/4, then 3/4 ROM4:5A0D F5 push af ROM4:5A0E C5 push bc ROM4:5A0F CD DB 20 call 20DB // PRNG, between 0 and 255 ROM4:5A12 FA 1C DB ld a,(DB1C) ROM4:5A15 FE 00 cp a,00 ROM4:5A17 20 2C jr nz,5A45 // If PRN ≠ 0, get out of this function ROM4:5A19 3E 00 ld a,00 ROM4:5A1B EA 1A DB ld (DB1A),a // min = 0 ROM4:5A1E 3E 03 ld a,03 ROM4:5A20 EA 1B DB ld (DB1B),a // max = 3 ROM4:5A23 CD 0B 21 call 210B // PRNG, between 0 and 3 ROM4:5A26 FA 1C DB ld a,(DB1C) ROM4:5A29 FE 00 cp a,00 ROM4:5A2B 20 18 jr nz,5A45 // If(PRN ≠ 0), get out of this function ROM4:5A2D F0 DC ld a,(ff00+DC) ROM4:5A2F 47 ld b,a // b = Stage 5 opponent ID ROM4:5A30 3E 00 ld a,00 ROM4:5A32 EA 1A DB ld (DB1A),a // min = 0 ROM4:5A35 3E 03 ld a,03 ROM4:5A37 EA 1B DB ld (DB1B),a // max = 3 ROM4:5A3A CD 0B 21 call 210B // PRNG, between 0 and 3 ROM4:5A3D FA 1C DB ld a,(DB1C) ROM4:5A40 B8 cp b ROM4:5A41 28 02 jr z,5A45 // If(PRN == Stage 5 opponent ID), get out of this function ROM4:5A43 E0 DC ld (ff00+DC),a // Load new Stage 5 opponent ID in (FFDC) ROM4:5A45 C1 pop bc ROM4:5A46 F1 pop af ROM4:5A47 C9 ret
Bank 5
Deck Capacity
Initial DC
- 0x15B2E-0x15B45 - Initial Deck Capacity
ROM5:5B2E FE 00 cp a,00 ROM5:5B30 20 0A jr nz,5B3C ;if debug, jump to 5:5B3C ROM5:5B32 3E 90 ld a,90 ROM5:5B34 E0 D9 ld (ff00+D9),a ROM5:5B36 3E 01 ld a,01 ROM5:5B38 E0 DA ld (ff00+DA),a ;set Deck Capacity to 400 ROM5:5B3A 18 08 jr 5B44 ROM5:5B3C 3E 0F ld a,0F ROM5:5B3E E0 D9 ld (ff00+D9),a ROM5:5B40 3E 27 ld a,27 ROM5:5B42 E0 DA ld (ff00+DA),a ;set Deck Capacity to 9999 ROM5:5B44 F1 pop af ROM5:5B45 C9 ret
Retrieve current DC
ROM5:5B46 F5 push af ROM5:5B47 F0 D9 ld a,(ff00+D9) ROM5:5B49 4F ld c,a ROM5:5B4A F0 DA ld a,(ff00+DA) ROM5:5B4C 47 ld b,a ;bc = deck_capacity ROM5:5B4D F1 pop af ROM5:5B4E C9 ret
5:5B4F
ROM5:5B4F C5 push bc ROM5:5B50 F0 D9 ld a,(ff00+D9) ROM5:5B52 4F ld c,a ROM5:5B53 F0 DA ld a,(ff00+DA) ROM5:5B55 47 ld b,a ;bc = deck_capacity ROM5:5B56 CD 60 5B call 5B60 ROM5:5B59 C1 pop bc ROM5:5B5A C9 ret
a = 13, push / pop deck_capacity
ROM5:5B5B C5 push bc ROM5:5B5C 3E 0D ld a,0D ROM5:5B5E C1 pop bc ROM5:5B5F C9 ret
Duelist Level calculation
ROM5:5B60 C5 push bc ROM5:5B61 D5 push de ROM5:5B62 79 ld a,c ROM5:5B63 D6 90 sub a,90 ROM5:5B65 5F ld e,a ROM5:5B66 78 ld a,b ROM5:5B67 DE 01 sbc a,01 ROM5:5B69 57 ld d,a ;de = deck_capacity - 400 ROM5:5B6A 01 07 00 ld bc,0007 ;bc = 7 ROM5:5B6D CD 42 14 call 1442 ROM5:5B70 7B ld a,e ROM5:5B71 C6 0F add a,0F ;a += 15 ROM5:5B73 5F ld e,a ROM5:5B74 7A ld a,d ROM5:5B75 CE 00 adc a,00 ROM5:5B77 57 ld d,a ROM5:5B78 7A ld a,d ROM5:5B79 FE 00 cp a,00 ROM5:5B7B 28 02 jr z,5B7F ROM5:5B7D 1E FF ld e,FF ROM5:5B7F 7B ld a,e ROM5:5B80 D1 pop de ROM5:5B81 C1 pop bc ROM5:5B82 C9 ret
Increment DC
ROM5:5B83 F5 push af ROM5:5B84 C5 push bc ROM5:5B85 D5 push de ROM5:5B86 F0 D9 ld a,(ff00+D9) ROM5:5B88 C6 01 add a,01 ROM5:5B8A 4F ld c,a ROM5:5B8B F0 DA ld a,(ff00+DA) ROM5:5B8D CE 00 adc a,00 ROM5:5B8F 47 ld b,a ;deck_capacity ++ ROM5:5B90 11 0F 27 ld de,270F ;de = 9999 ROM5:5B93 CD A7 1D call 1DA7 ROM5:5B96 FE 00 cp a,00 ROM5:5B98 20 02 jr nz,5B9C ;if(deck_capacity ≤ 9999), jump to 5:5B9C ROM5:5B9A 42 ld b,d ROM5:5B9B 4B ld c,e ;else deck_capacity = 9999 ROM5:5B9C 79 ld a,c ROM5:5B9D E0 D9 ld (ff00+D9),a ROM5:5B9F 78 ld a,b ROM5:5BA0 E0 DA ld (ff00+DA),a ;store deck_capacity in hFFD9 ROM5:5BA2 D1 pop de ROM5:5BA3 C1 pop bc ROM5:5BA4 F1 pop af ROM5:5BA5 C9 ret
Decrement DC
ROM5:5BA6 F5 push af ROM5:5BA7 C5 push bc ROM5:5BA8 D5 push de ROM5:5BA9 F0 D9 ld a,(ff00+D9) ROM5:5BAB D6 01 sub a,01 ROM5:5BAD 4F ld c,a ROM5:5BAE F0 DA ld a,(ff00+DA) ROM5:5BB0 DE 00 sbc a,00 ROM5:5BB2 47 ld b,a ;deck_capacity -- ROM5:5BB3 11 90 01 ld de,0190 ;de = 400 ROM5:5BB6 CD A7 1D call 1DA7 ROM5:5BB9 FE 02 cp a,02 ROM5:5BBB 20 02 jr nz,5BBF ;if(deck_capacity ≥ 400), jump to 5:5BBF ROM5:5BBD 42 ld b,d ROM5:5BBE 4B ld c,e ;else deck_capacity = 400 ROM5:5BBF 79 ld a,c ROM5:5BC0 E0 D9 ld (ff00+D9),a ROM5:5BC2 78 ld a,b ROM5:5BC3 E0 DA ld (ff00+DA),a ;store deck_capacity in hFFD9 ROM5:5BC5 D1 pop de ROM5:5BC6 C1 pop bc ROM5:5BC7 F1 pop af ROM5:5BC8 C9 ret
DC + 3
ROM5:5BC9 F5 push af ROM5:5BCA 3E 03 ld a,03 ROM5:5BCC CD 83 5B call 5B83 ;Increment DC ROM5:5BCF 3D dec a ROM5:5BD0 20 FA jr nz,5BCC ROM5:5BD2 F1 pop af ROM5:5BD3 C9 ret
DC + 2
ROM5:5BD4 F5 push af ROM5:5BD5 3E 02 ld a,02 ROM5:5BD7 CD 83 5B call 5B83 ;Increment DC ROM5:5BDA 3D dec a ROM5:5BDB 20 FA jr nz,5BD7 ROM5:5BDD F1 pop af ROM5:5BDE C9 ret
DC + 10
ROM5:5BDF F5 push af ROM5:5BE0 3E 0A ld a,0A ROM5:5BE2 CD 83 5B call 5B83 ;Increment DC ROM5:5BE5 3D dec a ROM5:5BE6 20 FA jr nz,5BE2 ROM5:5BE8 F1 pop af ROM5:5BE9 C9 ret
DC + 5
ROM5:5BEA F5 push af ROM5:5BEB 3E 05 ld a,05 ROM5:5BED CD 83 5B call 5B83 ;Increment DC ROM5:5BF0 3D dec a ROM5:5BF1 20 FA jr nz,5BED ROM5:5BF3 F1 pop af ROM5:5BF4 C9 ret
DC + 1
ROM5:5BF5 F5 push af ROM5:5BF6 3E 01 ld a,01 ROM5:5BF8 CD 83 5B call 5B83 ;Increment DC ROM5:5BFB 3D dec a ROM5:5BFC 20 FA jr nz,5BF8 ROM5:5BFE F1 pop af ROM5:5BFF C9 ret
DC - 50
ROM5:5C00 F5 push af ROM5:5C01 C5 push bc ROM5:5C02 D5 push de ROM5:5C03 01 32 00 ld bc,0032 ROM5:5C06 11 00 00 ld de,0000 ROM5:5C09 CD A6 5B call 5BA6 ;Decrement DC ROM5:5C0C 0B dec bc ROM5:5C0D CD 98 1D call 1D98 ROM5:5C10 FE 00 cp a,00 ROM5:5C12 20 F5 jr nz,5C09 ROM5:5C14 D1 pop de ROM5:5C15 C1 pop bc ROM5:5C16 F1 pop af ROM5:5C17 C9 ret
5:5C18
ROM5:5C18 C5 push bc
ROM5:5C19 D5 push de
ROM5:5C1A E5 push hl
ROM5:5C1B 2E 00 ld l,00
ROM5:5C1D CF rst 08
09 0E
ROM5:5C20 F0 D9 ld a,(ff00+D9)
ROM5:5C22 5F ld e,a
ROM5:5C23 F0 DA ld a,(ff00+DA)
ROM5:5C25 57 ld d,a ;de = deck_capacity
ROM5:5C26 CD A7 1D call 1DA7
ROM5:5C29 FE 00 cp a,00
ROM5:5C2B 20 02 jr nz,5C2F
ROM5:5C2D 2E 01 ld l,01
ROM5:5C2F 7D ld a,l
ROM5:5C30 E1 pop hl
ROM5:5C31 D1 pop de
ROM5:5C32 C1 pop bc
ROM5:5C33 C9 ret
Check Link Duel DC
ROM5:5C34 C5 push bc
ROM5:5C35 D5 push de
ROM5:5C36 E5 push hl
ROM5:5C37 CF rst 08
09 0E
ROM5:5C3A 16 00 ld d,00
ROM5:5C3C CF rst 08
89 0E
ROM5:5C3F 5F ld e,a
ROM5:5C40 CB 23 sla e
ROM5:5C42 21 59 5C ld hl,5C59
ROM5:5C45 19 add hl,de
ROM5:5C46 2A ldi a,(hl)
ROM5:5C47 56 ld d,(hl)
ROM5:5C48 5F ld e,a ;de = max_deck_capacity
ROM5:5C49 CD A7 1D call 1DA7
ROM5:5C4C 2E 00 ld l,00
ROM5:5C4E FE 00 cp a,00
ROM5:5C50 20 02 jr nz,5C54
ROM5:5C52 2E 01 ld l,01
ROM5:5C54 7D ld a,l
ROM5:5C55 E1 pop hl
ROM5:5C56 D1 pop de
ROM5:5C57 C1 pop bc
ROM5:5C58 C9 ret
Link Duel DC array
ROM5:5C59 F4 01 - 500 BC 02 - 700 E8 03 - 1000 D0 07 - 2000 0F 27 - 9999
Check if enough DC for Password mode
- Check if Deck Capacity ≥ 600 when trying to access Password menu
ROM5:5C63 C5 push bc ROM5:5C64 D5 push de ROM5:5C65 E5 push hl ROM5:5C66 2E 00 ld l,00 ROM5:5C68 01 58 02 ld bc,0258 ;bc = 600 ROM5:5C6B F0 D9 ld a,(ff00+D9) ROM5:5C6D 5F ld e,a ROM5:5C6E F0 DA ld a,(ff00+DA) ROM5:5C70 57 ld d,a ;de = Deck Capacity ROM5:5C71 CD A7 1D call 1DA7 ROM5:5C74 FE 00 cp a,00 ROM5:5C76 20 02 jr nz,5C7A ROM5:5C78 2E 01 ld l,01 ROM5:5C7A 7D ld a,l ROM5:5C7B E1 pop hl ROM5:5C7C D1 pop de ROM5:5C7D C1 pop bc ROM5:5C7E C9 ret
Bank D
Grandpa
- 0x34037-0x34050 - Check if it is a debug game, or if Grandpa's password has been entered
ROMD:4037 FE 00 cp a,00 ROMD:4039 20 07 jr nz,4042 ;if(debug), jump to D:4042 ROMD:403B CF rst 08 ROMD:403C 25 dec h ROMD:403D 04 inc b ROMD:403E FE 00 cp a,00 ROMD:4040 20 0C jr nz,404E ;else if(!grandpa_drop), get out of this function ROMD:4042 CD 5D 40 call 405D ROMD:4045 CF rst 08
- 0x34037-0x34050 - ?
ROMD:4046 0D dec c ROMD:4047 01 CF 17 ld bc,17CF ROMD:404A 01 CF 23 ld bc,23CF ROMD:404D 02 ld (bc),a ROMD:404E C1 pop bc ROMD:404F F1 pop af ROMD:4050 C9 ret
- 0x34051-0x3405C - ?
ROMD:4051 F5 push af ROMD:4052 06 00 ld b,00 ROMD:4054 CF rst 08 ROMD:4055 0F rrca ROMD:4056 02 ld (bc),a ROMD:4057 4F ld c,a ROMD:4058 CD E7 29 call 29E7 ROMD:405B F1 pop af ROMD:405C C9 ret
- 0x3405D-0x34066 - ?
ROMD:405D F5 push af ROMD:405E 06 00 ld b,00 ROMD:4060 0E 12 ld c,12 ROMD:4062 CD E7 29 call 29E7 // Gives a random Card ROMD:4065 F1 pop af ROMD:4066 C9 ret
Password mode
D:43B2 (Check ? when accessing Password)
ROMD:43B2 C5 push bc
ROMD:43B3 D5 push de
ROMD:43B4 CF rst 08
09 01
ROMD:43B7 16 00 ld d,00
ROMD:43B9 78 ld a,b
ROMD:43BA FE 00 cp a,00
ROMD:43BC 20 0C jr nz,43CA ;if(b ≠ 0), exit this function
ROMD:43BE 79 ld a,c
ROMD:43BF FE 00 cp a,00
ROMD:43C1 20 07 jr nz,43CA ;if(c ≠ 0), exit this function
ROMD:43C3 7B ld a,e
ROMD:43C4 FE 32 cp a,32
ROMD:43C6 30 02 jr nc,43CA ;if(e ≥ 50), exit this function
ROMD:43C8 16 01 ld d,01 ;d = 1
ROMD:43CA 7A ld a,d ;a = 1
ROMD:43CB D1 pop de
ROMD:43CC C1 pop bc
ROMD:43CD C9 ret
Card Passwords
- 0x3476A-0x352A9 - Cards Passwords
Bank E
Is there a Save file ?
- 0x3BB64-0x3BB6C - Is there a Save file ?
ROME:7B64 F5 push af ROME:7B65 FA 88 DB ld a,(DB88) ROME:7B68 FE 00 cp a,00 ROME:7B6A 20 03 jr nz,7B6F // If there is a save file, check its integrity ROME:7B6C CF rst 08 // Else create a new Save file
rst 08 pointers
- 0x3BB6D-0x3BB75 - Pointers + Bank used after a rst 08
0F 04 - Normal New Game CF - rst 08 09 04 - Save file sanity check CF - rst 08 0D 04
Bank 18
Graphics 2
0x48000 - ?
Bank 24 - 25
Card drops lists
0x90002 - Card drops lists, each drop rate is encoded on 3 nibbles, out of 2048.
aa ab bb cc cd dd ...
Bank 26 - 27
CPU Decks
0x98002 - CPU Decks cards lists, each card probability is encoded on 3 nibbles, out of 2048.
aa ab bb cc cd dd ...
Bank 28
Graphics 3
0xA0000 - ?
Bank 3B
rst 08 pointer
- 0xEC002-0xEC003 - rst 08 pointer
04 40
Game Initialization
Name Input screen display
- 0xEC004-0xEC043 - Name Input screen
RO3B:4004 F5 push af RO3B:4005 C5 push bc RO3B:4006 D5 push de RO3B:4007 E5 push hl RO3B:4008 4F ld c,a RO3B:4009 F0 FF ld a,(ff00+FF) RO3B:400B 57 ld d,a RO3B:400C E6 FC and a,FC RO3B:400E E0 FF ld (ff00+FF),a // Disable V-Blank and LCD STAT RO3B:4010 D5 push de RO3B:4011 CD 50 40 call 4050 // Blanks screen, checks system running the game RO3B:4014 F5 push af RO3B:4015 F0 DE ld a,(ff00+DE) // a = (FFDE) RO3B:4017 FE 00 cp a,00 RO3B:4019 20 04 jr nz,401F RO3B:401B E8 04 add sp,04 RO3B:401D 18 20 jr 403F RO3B:401F FE 01 cp a,01 RO3B:4021 20 04 jr nz,4027 RO3B:4023 E8 04 add sp,04 RO3B:4025 18 18 jr 403F RO3B:4027 F1 pop af RO3B:4028 06 00 ld b,00 RO3B:402A 21 44 40 ld hl,4044 RO3B:402D 09 add hl,bc RO3B:402E 2A ldi a,(hl) RO3B:402F 66 ld h,(hl) RO3B:4030 6F ld l,a RO3B:4031 01 36 40 ld bc,4036 RO3B:4034 C5 push bc RO3B:4035 E9 jp hl RO3B:4036 D1 pop de RO3B:4037 21 40 FF ld hl,FF40 RO3B:403A CB FE set 7,(hl) RO3B:403C 7A ld a,d RO3B:403D E0 FF ld (ff00+FF),a // Restore previous Interrupt flags RO3B:403F E1 pop hl RO3B:4040 D1 pop de RO3B:4041 C1 pop bc RO3B:4042 F1 pop af RO3B:4043 C9 ret
Blanks screen, checks system running the game
- 0xEC050-0xEC0CC - Blanks screen, checks system running the game
RO3B:4050 F5 push af RO3B:4051 C5 push bc RO3B:4052 D5 push de RO3B:4053 E5 push hl RO3B:4054 FE 00 cp a,00 RO3B:4056 20 70 jr nz,40C8 RO3B:4058 3E 00 ld a,00 RO3B:405A E0 47 ld (ff00+47),a // White BG (Game Boy only) RO3B:405C 21 40 FF ld hl,FF40 RO3B:405F CB FE set 7,(hl) // Enable LCD Display RO3B:4061 21 0F 45 ld hl,450F RO3B:4064 CD 16 41 call 4116 RO3B:4067 1E 00 ld e,00 RO3B:4069 F0 44 ld a,(ff00+44) // LCD Y-Coordinate RO3B:406B FE 00 cp a,00 RO3B:406D 20 FA jr nz,4069 // Wait for LCD Driver to be on first vertical line RO3B:406F F0 44 ld a,(ff00+44) RO3B:4071 FE 90 cp a,90 RO3B:4073 38 FA jr c,406F // Wait for V-Blank period RO3B:4075 16 0A ld d,0A RO3B:4077 3E 20 ld a,20 // Button keys RO3B:4079 E0 00 ld (ff00+00),a RO3B:407B F0 00 ld a,(ff00+00) RO3B:407D F0 00 ld a,(ff00+00) RO3B:407F 3E 10 ld a,10 // Direction keys RO3B:4081 E0 00 ld (ff00+00),a RO3B:4083 F0 00 ld a,(ff00+00) RO3B:4085 F0 00 ld a,(ff00+00) RO3B:4087 F0 00 ld a,(ff00+00) RO3B:4089 F0 00 ld a,(ff00+00) RO3B:408B F0 00 ld a,(ff00+00) RO3B:408D F0 00 ld a,(ff00+00) RO3B:408F 3E 30 ld a,30 // Button keys and Direction keys RO3B:4091 E0 00 ld (ff00+00),a RO3B:4093 3E 30 ld a,30 RO3B:4095 E0 00 ld (ff00+00),a RO3B:4097 3E 30 ld a,30 RO3B:4099 E0 00 ld (ff00+00),a RO3B:409B 3E 30 ld a,30 RO3B:409D E0 00 ld (ff00+00),a RO3B:409F F0 00 ld a,(ff00+00) RO3B:40A1 FE FE cp a,FE RO3B:40A3 20 02 jr nz,40A7 RO3B:40A5 1E 01 ld e,01 RO3B:40A7 15 dec d RO3B:40A8 20 CD jr nz,4077 // Loop 10 times RO3B:40AA 21 1F 45 ld hl,451F RO3B:40AD CD 16 41 call 4116 // Initialize Joypad RO3B:40B0 16 00 ld d,00 RO3B:40B2 06 00 ld b,00 RO3B:40B4 CB 23 sla e RO3B:40B6 0E 00 ld c,00 RO3B:40B8 F0 DD ld a,(ff00+DD) // a = System running the game RO3B:40BA FE FF cp a,FF RO3B:40BC 20 02 jr nz,40C0 RO3B:40BE 0E 01 ld c,01 RO3B:40C0 21 CD 40 ld hl,40CD RO3B:40C3 19 add hl,de RO3B:40C4 09 add hl,bc RO3B:40C5 7E ld a,(hl) // Read corresponding value from array 3B:40CD RO3B:40C6 E0 DE ld (ff00+DE),a RO3B:40C8 E1 pop hl RO3B:40C9 D1 pop de RO3B:40CA C1 pop bc RO3B:40CB F1 pop af RO3B:40CC C9 ret
System running the game array
RO3B:40CD 00 - Game Boy Color 01 02 - Game Boy 03 - Super Game Boy 2
Wait for Input
- 0xEC116-0xEC15B - Wait for Input at the Name Input screen
RO3B:4116 F5 push af RO3B:4117 C5 push bc RO3B:4118 D5 push de RO3B:4119 F0 44 ld a,(ff00+44) // LCD Y-Coordinate RO3B:411B FE 90 cp a,90 RO3B:411D 38 FA jr c,4119 // Wait for V-Blank period RO3B:411F 3E 30 ld a,30 RO3B:4121 E0 00 ld (ff00+00),a RO3B:4123 3E 00 ld a,00 RO3B:4125 E0 00 ld (ff00+00),a RO3B:4127 3E 30 ld a,30 RO3B:4129 E0 00 ld (ff00+00),a // Initialize Joypad RO3B:412B 16 10 ld d,10 RO3B:412D 2A ldi a,(hl) RO3B:412E 47 ld b,a RO3B:412F 1E 08 ld e,08 RO3B:4131 CB 38 srl b RO3B:4133 38 0A jr c,413F RO3B:4135 3E 20 ld a,20 RO3B:4137 E0 00 ld (ff00+00),a RO3B:4139 3E 30 ld a,30 RO3B:413B E0 00 ld (ff00+00),a RO3B:413D 18 08 jr 4147 RO3B:413F 3E 10 ld a,10 RO3B:4141 E0 00 ld (ff00+00),a RO3B:4143 3E 30 ld a,30 RO3B:4145 E0 00 ld (ff00+00),a RO3B:4147 1D dec e RO3B:4148 20 E7 jr nz,4131 RO3B:414A 15 dec d RO3B:414B 20 E0 jr nz,412D RO3B:414D 3E 20 ld a,20 RO3B:414F E0 00 ld (ff00+00),a RO3B:4151 3E 30 ld a,30 RO3B:4153 E0 00 ld (ff00+00),a RO3B:4155 CD 5C 41 call 415C RO3B:4158 D1 pop de RO3B:4159 C1 pop bc RO3B:415A F1 pop af RO3B:415B C9 ret
Bank 3E
Set wC920 to accumulator
RO3E:4076 EA 20 C9 ld (C920),a RO3E:4079 C9 ret
Bank 40
40:4002 (to document, probably card drop subroutine)
RO40:4002 C3 26 40 jp 4026 RO40:4005 C3 3B 40 jp 403B RO40:4008 C3 50 40 jp 4050 RO40:400B C3 65 40 jp 4065 RO40:400E C3 7A 40 jp 407A RO40:4011 C3 8F 40 jp 408F RO40:4014 C3 A4 40 jp 40A4 RO40:4017 C3 B9 40 jp 40B9 RO40:401A C3 CE 40 jp 40CE RO40:401D C3 E3 40 jp 40E3 RO40:4020 C3 F8 40 jp 40F8 RO40:4023 C3 0D 41 jp 410D
40:410D (to document)
RO40:410D F5 push af RO40:410E E5 push hl RO40:410F 21 15 4B ld hl,4B15 RO40:4112 09 add hl,bc RO40:4113 56 ld d,(hl) // Stores bank 24 or 25 to register d, from array at RO40:4B15 RO40:4114 CB 21 sla c RO40:4116 CB 10 rl b RO40:4118 21 2D 4B ld hl,4B2D RO40:411B 09 add hl,bc RO40:411C 2A ldi a,(hl) RO40:411D 46 ld b,(hl) RO40:411E 4F ld c,a RO40:411F E1 pop hl RO40:4120 F1 pop af RO40:4121 C9 ret
40:4B15 (Bank and pointers arrays)
- 0x100B15 - 0x100B2C - Array, bank 24 or 25
RO40:4B15 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 25 25 25 25 25 25 25 25 25
- 0x100B2D - 0x100B5C - Array, pointers
RO40:4B2D 02 40 3A 44 72 48 AA 4C E2 50 1A 55 52 59 52 59 8A 5D C2 61 FA 65 32 6A 6A 6E A2 72 DA 76 02 40 3A 44 72 48 72 48 AA 4C E2 50 1A 55 52 59 8A 5D
| Internal Data for Yu-Gi-Oh! Duel Monsters II: Dark Duel Stories |
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ROM Map • RAM Map • Text Table • Notes • Tutorials |