; ; Game Gear (Majesco) BIOS ; Dumped by Mike Gordon on the 04/22/2001 ; Disassembled and commented by Omar Cornut on the 04/22/2001 ; Version 1 ; 00000000: F3 DI ; Disable interrupts 00000001: 21 00 00 LD HL,0000h ; Set paging registers 00000004: 22 FC FF LD (FFFCh),HL ; -> Disable SRAM 00000007: 21 01 02 LD HL,0201h ; -> 0:0, 1:1, 2:2 0000000A: 22 FE FF LD (FFFEh),HL ; 0000000D: 21 00 C0 LD HL,C000h ; Clear RAM 00000010: 11 01 C0 LD DE,C001h ; from C000h to DFF0h 00000013: 01 EF 1F LD BC,1FEFh ; 00000016: 75 LD (HL),L ; 00000017: ED B0 LDIR ; 00000019: 31 F0 DF LD SP,DFF0h ; Init stack pointer @ DFF0h 0000001C: 3E F5 LD A,F5h ; Gear-to-gear stuffs 0000001E: D3 02 OUTA (02h) ; .. 00000020: DB 02 INA (02h) ; .. 00000022: FE F5 CP F5h ; 00000024: 20 0B JR NZ,+0Bh ; 00000026: 3E FA LD A,FAh ; 00000028: D3 02 OUTA (02h) ; 0000002A: DB 02 INA (02h) ; 0000002C: FE FA CP FAh ; 0000002E: 20 01 JR NZ,+01h ; 00000030: AF XOR A ; Copy a detected configuration 00000031: 32 01 C7 LD (C701h),A ; thing to RAM[701h] 00000034: 3E FF LD A,FFh ; Later called 'Gear-to-Gear xx option' 00000036: D3 02 OUTA (02h) ; 00000038: DB 7E INA (7Eh) ; Wait for Vertical Blank 0000003A: FE B0 CP B0h ; 0000003C: 20 FA JR NZ,-06h ; 0000003E: 11 00 7F LD DE,7F00h ; Set VDP address to 3F00h (&Sprite_0_Y) 00000041: CD 22 01 CALL VDP_Set_Addr (0122h) then write D0h to disable 00000044: 3E D0 LD A,D0h ; sprites. 00000046: D3 BE OUTA (BEh) ; 00000048: 21 E9 03 LD HL,03E9h ; Init VDP Registers 0000004B: 01 BF 16 LD BC,16BFh ; Stored at 03E9h 0000004E: ED B3 OTIR ; 00000050: 21 00 C0 LD HL,C000h ; 00000053: 11 00 78 LD DE,7800h ; Set VDP address to 3800h (&Tile_256) 00000056: CD 22 01 CALL VDP_Set_Addr (0122h) 00000059: 0E BE LD C,BEh ; 0000005B: ED B3 OTIR ; Copy 22*6 == 132 bytes from 0000005D: ED B3 OTIR ; the beginning of RAM to 0000005F: ED B3 OTIR ; Video ram ?? 00000061: ED B3 OTIR ; 00000063: 18 03 JR +03h ФФФФФФФП ; -> (A) 00000065: 00 NOP Г Г -- NMI Г 00000066: ED 45 RETN Г ; Return from NMI (unused) Г 00000068: ED B3 OTIR <ФФФФФФФФФй ; (A) 0000006A: ED B3 OTIR ; 0000006C: 21 00 C0 LD HL,C000h ; Write palette memory, 0000006F: 11 00 C0 LD DE,C000h ; with source being C000h 00000072: 01 BE 40 LD BC,40BEh ; (beginning of RAM) 00000075: CD 22 01 CALL VDP_Set_Addr (0122h) ?? 00000078: ED B3 OTIR ; 0000007A: 21 6A 01 LD HL,016Ah ; 0000007D: 06 04 LD B,04h ; 0000007F: 3A 01 C7 LD A,(C701h) ; Load Gear-to-Gear ?? option 00000082: B7 OR A ; Depending on it, copy 00000083: 20 03 JR NZ,+03h ; source will be from 016Ah 00000085: 21 66 01 LD HL,0166h ; or 0166h 00000088: CD 22 01 CALL VDP_Set_Addr (0122h) 0000008B: ED B3 OTIR ; 0000008D: 21 DC 02 LD HL,02DCh ; 00000090: 3A 01 C7 LD A,(C701h) ; 00000093: B7 OR A ; 00000094: 20 03 JR NZ,+03h ; 00000096: 21 6C 01 LD HL,016Ch ; 00000099: 11 00 40 LD DE,4000h ; 0000009C: CD 29 01 CALL 0129h 0000009F: CD FA 00 CALL Check_TMR_Sega (00FAh) ; Check for "TMR SEGA" string 000000A2: 3A 00 C7 LD A,(C700h) ; Read result (stored there) 000000A5: B7 OR A ; If it's zero, goes to an infinite loop ; Else, it should be a 'A' 000000A6: 28 FE JR Z,-02h ; *CRACK* Write 00,00 to A6h to bypass the check 000000A8: 21 AA 03 LD HL,03AAh 000000AB: 3A 01 C7 LD A,(C701h) 000000AE: B7 OR A 000000AF: 20 03 JR NZ,+03h 000000B1: 21 6B 03 LD HL,036Bh 000000B4: 11 4C 7A LD DE,7A4Ch 000000B7: 06 15 LD B,15h 000000B9: CD 51 01 CALL 0151h 000000BC: 11 CC 7A LD DE,7ACCh 000000BF: 06 15 LD B,15h 000000C1: CD 51 01 CALL 0151h 000000C4: 11 4C 7B LD DE,7B4Ch 000000C7: 06 15 LD B,15h 000000C9: CD 51 01 CALL 0151h 000000CC: 11 E0 81 LD DE,81E0h ; VDP_Reg[1] = E0h 000000CF: CD 22 01 CALL VDP_Set_Reg (0122h); Enable VBL Interrupt 000000D2: 06 07 LD B,07h ; Big loop, catched by the 000000D4: 21 00 00 LD HL,0000h <ФФП ; vertical blanking interrupt 000000D7: 2B DEC HL <ФФФФП Г ; *CRACK* Write 01 at 0xD6 to disable startup delay 000000D8: 7D LD A,L Г Г ; It is supposed to be a delay? 000000D9: B4 OR H Г Г ; It *might* be really needed 000000DA: 20 FB JR NZ,-05h Фй Г ; 000000DC: 10 F9 DJNZ -07h ФФФФФй ; 000000DE: 11 A0 81 LD DE,81A0h ; VDP_Reg[1] = A0h 000000E1: CD 22 01 CALL VDP_Set_Reg (0122h); Disable VBL Interrupt 000000E4: 21 F2 00 LD HL,00F2h ; Copy 8 bytes of code 000000E7: 11 00 C8 LD DE,C800h ; from 0xF2 to RAM[0x800] 000000EA: 01 08 00 LD BC,0008h ; (this is the mapping code) 000000ED: ED B0 LDIR ; .. 000000EF: C3 00 C8 JP C800h ; then jump there! -------- ; This function is copied and run, starting at RAM[800h] -- Function: Cartridge_Map 000000F2: 3E A8 LD A,A8h ; Write A8h to C000h 000000F4: 32 00 C0 LD (C000h),A ; Read back from C000h 000000F7: D3 3E OUTA (3Eh) ; And stick that to port 3Eh 000000F9: C7 RST 00h ; Reset.. start game ; Note from Zoop: ; This is where the game start ; Starting condition: VBL interrupts are disabled ; and VDP registers are as defined at 03E9h (00FAh) -- Function: Check_TMR_Sega 000000FA: CD 0E 01 CALL 010Eh ; Try to read at 1FF0h 000000FD: CD 09 01 CALL 0109h ; Else at 3FF0h 00000100: CD 04 01 CALL 0104h ; Else at 7FF0h 00000103: C9 RET ; If any is good, RAM[700h] will be set 00000104: 11 F0 1F LD DE,1FF0h ; de = 1FF0 00000107: 18 08 JR +08h ФФФФФФФФФФФФФФФФФФФФФФФП ; 00000109: 11 F0 3F LD DE,3FF0h Г ; de = 3FF0 0000010C: 18 03 JR +03h ФФФФФФФФФФФФФФФФФФФФФФФД ; 0000010E: 11 F0 7F LD DE,7FF0h Г ; de = 7FF0 00000111: 21 5E 01 LD HL,CONST_TMR_SEGA (015Eh) <Фй ; hl = "TMR SEGA" 00000114: 06 08 LD B,08h ; b = strlen(hl) 00000116: 1A LD A,(DE) <ФФФФФП ; 00000117: BE CP (HL) Г ; Compare strings 00000118: C0 RET NZ Г ; and return if 00000119: 23 INC HL Г ; they are differents 0000011A: 13 INC DE Г ; (-> not "TMR_SEGA") 0000011B: 10 F9 DJNZ -07h ФФФФФФй 0000011D: 32 00 C7 LD (C700h),A ; If found, write 'A' to RAM[700h] ('A' is the last char of "TMR_SEGA") 00000120: F1 POP AF ; and return to the caller of FAh 00000121: C9 RET ; by manually poping from the stack -- (0122h) -- Function: VDP_Set_Addr -- Function: VDP_Set_Reg -- In: DE -- Destroy: A 00000122: 7B LD A,E 00000123: D3 BF OUTA (BFh) 00000125: 7A LD A,D 00000126: D3 BF OUTA (BFh) 00000128: C9 RET -- (0129h) -- Function: xxx 00000129: 06 04 LD B,04h 0000012B: C5 PUSH BC 0000012C: D5 PUSH DE 0000012D: 7E LD A,(HL) 0000012E: 23 INC HL 0000012F: B7 OR A 00000130: 28 19 JR Z,+19h 00000132: CB BF RES 7,A 00000134: 47 LD B,A 00000135: CD 22 01 CALL VDP_Set_AddrReg (0122h) 00000138: 7E LD A,(HL) 00000139: D3 BE OUTA (BEh) 0000013B: F2 3F 01 JP P,013Fh ФФП 0000013E: 23 INC HL Г 0000013F: 13 INC DE <ФФФФФй 00000140: 13 INC DE 00000141: 13 INC DE 00000142: 13 INC DE 00000143: 10 F0 DJNZ -10h 00000145: FA 2D 01 JP M,012Dh 00000148: 23 INC HL 00000149: 18 E2 JR -1Eh 0000014B: D1 POP DE 0000014C: 13 INC DE 0000014D: C1 POP BC 0000014E: 10 DB DJNZ -25h 00000150: C9 RET -- (0151h) -- Function: 00000151: CD 22 01 CALL VDP_Set_AddrReg (0122h) 00000154: AF XOR A 00000155: 0E BE LD C,BEh <ФФФП 00000157: ED A3 OUTI Г 00000159: ED 79 OUT (C),A Г 0000015B: 20 F8 JR NZ,-08h ФФй 0000015D: C9 RET -- (015Eh) [DATA: CONST_TMR_SEGA] "TMR SEGA" [/DATA] (xxxxh) [DATA: ??] 00, 0F, EE, 0E [/DATA] (xxxxh) [DATA: ??] 30, 3F, 09, 00 [/DATA] 0000016E: 81 ADD C 0000016F: 0F RRCA 00000170: 03 INC BC 00000171: 0C INC C 00000172: 95 SUB L 00000173: 0F RRCA 00000174: 0C INC C 00000175: 0C INC C 00000176: 00 NOP 00000177: 8F ADC A 00000178: CC CC CF CALL Z,CFCCh 0000017B: 8C ADC H 0000017C: 0C INC C 0000017D: 0C INC C 0000017E: 00 NOP 0000017F: 87 ADD A 00000180: CC CC 8C CALL Z,8CCCh 00000183: CC CC C7 CALL Z,C7CCh 00000186: 00 NOP 00000187: 8F ADC A 00000188: 05 DEC B 00000189: CC 83 8F CALL Z,8F83h 0000018C: 00 NOP 0000018D: 8C ADC H 0000018E: 05 DEC B 0000018F: CC 83 87 CALL Z,8783h 00000192: 00 NOP 00000193: C7 RST 00h 00000194: 05 DEC B 00000195: CC 8B 87 CALL Z,878Bh 00000198: 00 NOP 00000199: 8F ADC A 0000019A: CC CC 0F CALL Z,0FCCh 0000019D: CC CC 8F CALL Z,8FCCh 000001A0: 00 NOP 000001A1: 9F SBC A 000001A2: 05 DEC B 000001A3: 19 ADD HL,DE 000001A4: 83 ADD E 000001A5: 9F SBC A 000001A6: 00 NOP 000001A7: 01 05 81 LD BC,8105h 000001AA: 8A ADC D 000001AB: 01 00 F1 LD BC,F100h 000001AE: 99 SBC C 000001AF: 99 SBC C 000001B0: F0 RET P 000001B1: 98 SBC B 000001B2: 98 SBC B 000001B3: F0 RET P 000001B4: 00 NOP 000001B5: 03 INC BC 000001B6: 98 SBC B 000001B7: 81 ADD C 000001B8: F0 RET P 000001B9: 03 INC BC 000001BA: 60 LD H,B 000001BB: 82 ADD D 000001BC: 00 NOP 000001BD: 0F RRCA 000001BE: 05 DEC B 000001BF: 19 ADD HL,DE 000001C0: 8E ADC (HL) 000001C1: 0F RRCA 000001C2: 00 NOP 000001C3: 1F RRA 000001C4: 99 SBC C 000001C5: 99 SBC C 000001C6: 9F SBC A 000001C7: 99 SBC C 000001C8: 99 SBC C 000001C9: 19 ADD HL,DE 000001CA: 00 NOP 000001CB: 00 NOP 000001CC: 80 ADD B 000001CD: 80 ADD B 000001CE: 00 NOP 000001CF: 03 INC BC 000001D0: 80 ADD B 000001D1: 81 ADD C 000001D2: 00 NOP 000001D3: 06 CC LD B,CCh 000001D5: 8B ADC E 000001D6: 78 LD A,B 000001D7: 00 NOP 000001D8: 8C ADC H 000001D9: CC EC FC CALL Z,FCECh 000001DC: FC DC CC CALL M,CCDCh 000001DF: 00 NOP 000001E0: F8 RET M 000001E1: 05 DEC B 000001E2: CC 8E F8 CALL Z,F88Eh 000001E5: 00 NOP 000001E6: F9 LD SP,HL 000001E7: C1 POP BC 000001E8: C1 POP BC 000001E9: F1 POP AF 000001EA: C1 POP BC 000001EB: C1 POP BC 000001EC: F9 LD SP,HL 000001ED: 00 NOP 000001EE: F0 RET P 000001EF: 98 SBC B 000001F0: 98 SBC B 000001F1: F0 RET P 000001F2: 03 INC BC 000001F3: 98 SBC B 000001F4: 81 ADD C 000001F5: 00 NOP 000001F6: 06 18 LD B,18h 000001F8: 83 ADD E 000001F9: 1F RRA 000001FA: 00 NOP 000001FB: 31 05 33 LD SP,3305h 000001FE: AE XOR (HL) 000001FF: 31 00 E3 LD SP,E300h 00000202: 33 INC SP 00000203: 33 INC SP 00000204: 03 INC BC 00000205: 33 INC SP 00000206: 33 INC SP 00000207: E3 EX HL,(SP) 00000208: 00 NOP 00000209: E4 06 07 CALL PO,0706h 0000020C: C7 RST 00h 0000020D: 06 06 LD B,06h 0000020F: E6 00 AND 00h 00000211: 63 LD H,E 00000212: 66 LD H,(HL) 00000213: 66 LD H,(HL) 00000214: E3 EX HL,(SP) 00000215: E0 RET PO 00000216: 66 LD H,(HL) 00000217: 23 INC HL 00000218: 00 NOP 00000219: C7 RST 00h 0000021A: 66 LD H,(HL) 0000021B: 06 C7 LD B,C7h 0000021D: 66 LD H,(HL) 0000021E: 66 LD H,(HL) 0000021F: C7 RST 00h 00000220: 00 NOP 00000221: C0 RET NZ 00000222: 00 NOP 00000223: 00 NOP 00000224: 80 ADD B 00000225: 00 NOP 00000226: 00 NOP 00000227: C0 RET NZ 00000228: 00 NOP 00000229: F9 LD SP,HL 0000022A: C1 POP BC 0000022B: C1 POP BC 0000022C: F1 POP AF 0000022D: 03 INC BC 0000022E: C1 POP BC 0000022F: 8A ADC D 00000230: 00 NOP 00000231: F0 RET P 00000232: 99 SBC C 00000233: 99 SBC C 00000234: F1 POP AF 00000235: 99 SBC C 00000236: 99 SBC C 00000237: 98 SBC B 00000238: 00 NOP 00000239: F1 POP AF 0000023A: 05 DEC B 0000023B: 99 SBC C 0000023C: BB CP E 0000023D: F1 POP AF 0000023E: 00 NOP 0000023F: 04 INC B 00000240: 8C ADC H 00000241: DC FC AC CALL C,ACFCh 00000244: 8C ADC H 00000245: 8C ADC H 00000246: 00 NOP 00000247: 78 LD A,B 00000248: CC C0 78 CALL Z,78C0h 0000024B: 0C INC C 0000024C: CC 78 00 CALL Z,0078h 0000024F: F8 RET M 00000250: C1 POP BC 00000251: C1 POP BC 00000252: F1 POP AF 00000253: C1 POP BC 00000254: C1 POP BC 00000255: F8 RET M 00000256: 00 NOP 00000257: F0 RET P 00000258: 98 SBC B 00000259: 98 SBC B 0000025A: 80 ADD B 0000025B: B9 CP C 0000025C: 99 SBC C 0000025D: F9 LD SP,HL 0000025E: 00 NOP 0000025F: 60 LD H,B 00000260: 60 LD H,B 00000261: F0 RET P 00000262: 90 SUB B 00000263: F8 RET M 00000264: 98 SBC B 00000265: 98 SBC B 00000266: 00 NOP 00000267: 1F RRA 00000268: 18 18 JR +18h 0000026A: 1E 18 LD E,18h 0000026C: 18 1F JR +1Fh 0000026E: 00 NOP 0000026F: 23 INC HL 00000270: 33 INC SP 00000271: 3B DEC SP 00000272: 3F CCF 00000273: 37 SCF 00000274: 33 INC SP 00000275: 31 00 3F LD SP,3F00h 00000278: 06 0C LD B,0Ch 0000027A: 8D ADC L 0000027B: 00 NOP 0000027C: 3E 30 LD A,30h 0000027E: 30 3C JR NC,+3Ch 00000280: 30 30 JR NC,+30h 00000282: 3E 00 LD A,00h 00000284: 7C LD A,H 00000285: 66 LD H,(HL) 00000286: 66 LD H,(HL) 00000287: 7C LD A,H 00000288: 03 INC BC 00000289: 66 LD H,(HL) 0000028A: 82 ADD D 0000028B: 00 NOP 0000028C: 7C LD A,H 0000028D: 03 INC BC 0000028E: 66 LD H,(HL) 0000028F: 9D SBC L 00000290: 7C LD A,H 00000291: 60 LD H,B 00000292: 60 LD H,B 00000293: 00 NOP 00000294: 63 LD H,E 00000295: 66 LD H,(HL) 00000296: 66 LD H,(HL) 00000297: 63 LD H,E 00000298: 60 LD H,B 00000299: 66 LD H,(HL) 0000029A: 63 LD H,E 0000029B: 00 NOP 0000029C: C7 RST 00h 0000029D: 0C INC C 0000029E: 0C INC C 0000029F: 87 ADD A 000002A0: 00 NOP 000002A1: 0C INC C 000002A2: C7 RST 00h 000002A3: 00 NOP 000002A4: 80 ADD B 000002A5: C0 RET NZ 000002A6: 00 NOP 000002A7: 80 ADD B 000002A8: C0 RET NZ 000002A9: C0 RET NZ 000002AA: 80 ADD B 000002AB: 00 NOP 000002AC: C1 POP BC 000002AD: 05 DEC B 000002AE: C0 RET NZ 000002AF: 83 ADD E 000002B0: FC 00 F9 CALL M,F900h 000002B3: 06 61 LD B,61h 000002B5: 82 ADD D 000002B6: 00 NOP 000002B7: F0 RET P 000002B8: 05 DEC B 000002B9: 98 SBC B 000002BA: 81 ADD C 000002BB: F0 RET P 000002BC: 06 00 LD B,00h 000002BE: 02 LD (BC),A 000002BF: C0 RET NZ 000002C0: 00 NOP 000002C1: 7F LD A,A 000002C2: 00 NOP 000002C3: 7F LD A,A 000002C4: 00 NOP 000002C5: 7F LD A,A 000002C6: 00 NOP 000002C7: 03 INC BC 000002C8: 00 NOP 000002C9: 00 NOP 000002CA: 7F LD A,A 000002CB: 00 NOP 000002CC: 7F LD A,A 000002CD: 00 NOP 000002CE: 7F LD A,A 000002CF: 00 NOP 000002D0: 03 INC BC 000002D1: 00 NOP 000002D2: 00 NOP 000002D3: 7F LD A,A 000002D4: 00 NOP 000002D5: 7F LD A,A 000002D6: 00 NOP 000002D7: 7F LD A,A 000002D8: 00 NOP 000002D9: 03 INC BC 000002DA: 00 NOP 000002DB: 00 NOP 000002DC: 08 EX AF,AF' 000002DD: 00 NOP 000002DE: 81 ADD C 000002DF: 7C LD A,H 000002E0: 03 INC BC 000002E1: 66 LD H,(HL) 000002E2: 81 ADD C 000002E3: 7C LD A,H 000002E4: 03 INC BC 000002E5: 60 LD H,B 000002E6: 81 ADD C 000002E7: 7C LD A,H 000002E8: 03 INC BC 000002E9: 66 LD H,(HL) 000002EA: 81 ADD C 000002EB: 7C LD A,H 000002EC: 03 INC BC 000002ED: 66 LD H,(HL) 000002EE: 81 ADD C 000002EF: 3C INC A 000002F0: 06 66 LD B,66h 000002F2: 82 ADD D 000002F3: 3C INC A 000002F4: 7C LD A,H 000002F5: 06 66 LD B,66h 000002F7: 81 ADD C 000002F8: 7C LD A,H 000002F9: 07 RLCA 000002FA: 66 LD H,(HL) 000002FB: 02 LD (BC),A 000002FC: 3C INC A 000002FD: 02 LD (BC),A 000002FE: 66 LD H,(HL) 000002FF: 02 LD (BC),A 00000300: 60 LD H,B 00000301: 02 LD (BC),A 00000302: 66 LD H,(HL) 00000303: 85 ADD L 00000304: 3C INC A 00000305: 7E LD A,(HL) 00000306: 60 LD H,B 00000307: 60 LD H,B 00000308: 7C LD A,H 00000309: 03 INC BC 0000030A: 60 LD H,B 0000030B: 85 ADD L 0000030C: 7E LD A,(HL) 0000030D: 7C LD A,H 0000030E: 66 LD H,(HL) 0000030F: 66 LD H,(HL) 00000310: 7C LD A,H 00000311: 03 INC BC 00000312: 66 LD H,(HL) 00000313: 81 ADD C 00000314: 7C LD A,H 00000315: 04 INC B 00000316: 66 LD H,(HL) 00000317: 81 ADD C 00000318: 3C INC A 00000319: 03 INC BC 0000031A: 18 88 JR -78h 0000031C: 46 LD B,(HL) 0000031D: 66 LD H,(HL) 0000031E: 76 HALT 0000031F: 7E LD A,(HL) 00000320: 7E LD A,(HL) 00000321: 6E LD L,(HL) 00000322: 66 LD H,(HL) 00000323: 62 LD H,D 00000324: 07 RLCA 00000325: 60 LD H,B 00000326: 82 ADD D 00000327: 7E LD A,(HL) 00000328: 3C INC A 00000329: 06 18 LD B,18h 0000032B: 02 LD (BC),A 0000032C: 3C INC A 0000032D: 8B ADC E 0000032E: 66 LD H,(HL) 0000032F: 60 LD H,B 00000330: 7C LD A,H 00000331: 3E 06 LD A,06h 00000333: 66 LD H,(HL) 00000334: 3C INC A 00000335: 7E LD A,(HL) 00000336: 60 LD H,B 00000337: 60 LD H,B 00000338: 7C LD A,H 00000339: 04 INC B 0000033A: 60 LD H,B 0000033B: 85 ADD L 0000033C: 41 LD B,C 0000033D: 63 LD H,E 0000033E: 77 LD (HL),A 0000033F: 7F LD A,A 00000340: 6B LD L,E 00000341: 03 INC BC 00000342: 63 LD H,E 00000343: 8D ADC L 00000344: 3C INC A 00000345: 66 LD H,(HL) 00000346: 66 LD H,(HL) 00000347: 60 LD H,B 00000348: 6E LD L,(HL) 00000349: 66 LD H,(HL) 0000034A: 66 LD H,(HL) 0000034B: 3E 3C LD A,3Ch 0000034D: 24 INC H 0000034E: 66 LD H,(HL) 0000034F: 66 LD H,(HL) 00000350: 7E LD A,(HL) 00000351: 03 INC BC 00000352: 66 LD H,(HL) 00000353: 81 ADD C 00000354: 7E LD A,(HL) 00000355: 07 RLCA 00000356: 18 06 JR +06h 00000358: 00 NOP 00000359: 02 LD (BC),A 0000035A: 18 00 JR +00h 0000035C: 7F LD A,A 0000035D: 00 NOP 0000035E: 21 00 00 LD HL,0000h 00000361: 7F LD A,A 00000362: 00 NOP 00000363: 21 00 00 LD HL,0000h 00000366: 7F LD A,A 00000367: 00 NOP 00000368: 21 00 00 LD HL,0000h 0000036B: 00 NOP 0000036C: 00 NOP 0000036D: 00 NOP 0000036E: 01 02 03 LD BC,0302h 00000371: 04 INC B 00000372: 05 DEC B 00000373: 06 07 LD B,07h 00000375: 08 EX AF,AF' 00000376: 09 ADD HL,BC 00000377: 0A LD A,(BC) 00000378: 0B DEC BC 00000379: 0C INC C 0000037A: 0D DEC C 0000037B: 0E 00 LD C,00h 0000037D: 00 NOP 0000037E: 00 NOP 0000037F: 00 NOP 00000380: 00 NOP 00000381: 00 NOP 00000382: 0F RRCA 00000383: 10 11 DJNZ +11h 00000385: 12 LD (DE),A 00000386: 13 INC DE 00000387: 14 INC D 00000388: 15 DEC D 00000389: 16 17 LD D,17h 0000038B: 18 19 JR +19h 0000038D: 1A LD A,(DE) 0000038E: 1B DEC DE 0000038F: 1C INC E 00000390: 1D DEC E 00000391: 1E 00 LD E,00h 00000393: 00 NOP 00000394: 00 NOP 00000395: 00 NOP 00000396: 1F RRA 00000397: 20 21 JR NZ,+21h 00000399: 22 23 24 LD (2423h),HL 0000039C: 25 DEC H 0000039D: 26 27 LD H,27h 0000039F: 28 27 JR Z,+27h 000003A1: 29 ADD HL,HL 000003A2: 19 ADD HL,DE 000003A3: 2A 2B 2C LD HL,(2C2Bh) 000003A6: 2D DEC L 000003A7: 2E 2F LD L,2Fh 000003A9: 00 NOP 000003AA: 00 NOP 000003AB: 00 NOP 000003AC: 00 NOP 000003AD: 01 02 03 LD BC,0302h 000003B0: 04 INC B 000003B1: 05 DEC B 000003B2: 06 07 LD B,07h 000003B4: 04 INC B 000003B5: 00 NOP 000003B6: 08 EX AF,AF' 000003B7: 09 ADD HL,BC 000003B8: 00 NOP 000003B9: 03 INC BC 000003BA: 02 LD (BC),A 000003BB: 00 NOP 000003BC: 00 NOP 000003BD: 00 NOP 000003BE: 00 NOP 000003BF: 00 NOP 000003C0: 05 DEC B 000003C1: 0A LD A,(BC) 000003C2: 04 INC B 000003C3: 07 RLCA 000003C4: 02 LD (BC),A 000003C5: 00 NOP 000003C6: 0B DEC BC 000003C7: 0C INC C 000003C8: 06 07 LD B,07h 000003CA: 0A LD A,(BC) 000003CB: 0D DEC C 000003CC: 07 RLCA 000003CD: 00 NOP 000003CE: 0E 02 LD C,02h 000003D0: 03 INC BC 000003D1: 0F RRCA 000003D2: 00 NOP 000003D3: 00 NOP 000003D4: 0D DEC C 000003D5: 07 RLCA 000003D6: 10 11 DJNZ +11h 000003D8: 00 NOP 000003D9: 07 RLCA 000003DA: 0A LD A,(BC) 000003DB: 12 LD (DE),A 000003DC: 07 RLCA 000003DD: 02 LD (BC),A 000003DE: 01 02 0C LD BC,0C02h 000003E1: 0D DEC C 000003E2: 07 RLCA 000003E3: 0D DEC C 000003E4: 00 NOP 000003E5: 0B DEC BC 000003E6: 12 LD (DE),A 000003E7: 04 INC B 000003E8: 13 INC DE (03E9h) [DATA: VDP Registers] 16h, 80h ; VDP_Reg[0] = 16h Configuration 1 A0h, 81h ; VDP_Reg[1] = A0h Configuration 2 FFh, 82h ; VDP_Reg[2] = FFh ; FFh, 83h ; VDP_Reg[3] = FFh ; FFh, 84h ; VDP_Reg[4] = FFh ; FFh, 85h ; VDP_Reg[5] = FFh ; FFh, 86h ; VDP_Reg[6] = FFh ; 00h, 87h ; VDP_Reg[7] = 00h Border 00h, 88h ; VDP_Reg[8] = 00h Horizontal Scrolling 00h, 89h ; VDP_Reg[9] = 00h Vertical Scrolling FFh, 8Ah ; VDP_Reg[10] = FFh Line counter [/DATA] 000003FF: FF RST 38h