Cart DB #494: 4 in 1 YH4118

Notes for chip search:

Use "+" as delimeter for all fields (except "cart name", where space is used); if many values are entered, all of them must appear in the cartridge then; case is not sensitive
"Mapper" is the actual mapper used by this cartridge hardware (might not match the one at wiki.nesdev.com, as at the moment I was analyzing this cartridge, there was no mapper assigned to it, so I had to assign my own number for testing)
"Original mapper" is the mapper used by licensed version of this game (for multicarts, it refers to mapper of the inside games, so 0+2 means this cartridge can run NROM+UNROM games)
Order in which you put values doesn't matter (you can write 7400+74138+7400 or 7400+7400+74138 to search for a cartridge that contains at least two 7400 chips and one 74138
Some chips (like PAL16*8) appear in cartridges as 16V8 or 16L8, so be sure to check both posibilities
Same goes for memories - type 27F080 to search for 32 pin memories, 27512 for 28 pin with two chip enables or MASKROM_1M_DIP28 for 28 pin with one chip enable
Same goes for mappers - some examples: AX5904(MMC1), AX5202P(MMC3), PT8154BM (9112MMC3), AX5208C(VRC4), 23C3662(VRC2)
Good news is that you can use wildcards, so 74139+*MMC3* will search for any cartrige that has at least one 74139 and MMC3 chip in any version

Name	Value
U1	BLOB

Name

Value

Reading of the cartridge did not give consistent results (few bytes in each bank was always non-stable). So I dumped it, found most similar roms and then analyzed manually it versus the official roms * single bytes that were different I replaced with the values from original rom * two or more continous values I left intact (two of the games were converted from MMC1 to MMC3 and also some copyright info was removd). +-----------------number of different bytes compared to original ROM | +--------original ROM size PRG | | 000000 | 228 | 131072 | d:\!EMU\Fceu\GRY\8820.Nes.Nintendo.Games\Japan\Top Gun - Dual Fighters (J).nes 020000 | 1256 | 131072 | d:\!EMU\Fceu\GRY\8820.Nes.Nintendo.Games\Japan\Airwolf (J).nes 040000 | 266 | 131072 | d:\!EMU\Fceu\GRY\8820.Nes.Nintendo.Games\USA\Silk Worm (U).nes 060000 | 2054 | 131072 | d:\!EMU\Fceu\GRY\8820.Nes.Nintendo.Games\USA\Gun Nac (U).nes CHR 000000 | 3572 | 131072 | d:\!EMU\Fceu\GRY\8820.Nes.Nintendo.Games\USA\Gun Nac (U).nes 020000 | 10 | 131072 | d:\!EMU\Fceu\GRY\8820.Nes.Nintendo.Games\Japan\Top Gun - Dual Fighters (J).nes 040000 | 495 | 131072 | d:\!EMU\Fceu\GRY\8820.Nes.Nintendo.Games\Japan\Airwolf (J).nes 060000 | 16 | 131072 | d:\!EMU\Fceu\GRY\8820.Nes.Nintendo.Games\USA\Silk Worm (U).nes At this moment I had working rom, after selecting each game from menu, bank code was writing to $6000/$6002/$6001. I couldnt find any pattern so again analzyed for each possible value of $6001 how the PRG and CHR banking behaves (by reading for example $8000-$9fff and comparing it with one of the chunks from previously dumped ROM that has the least differences, i was able to figute out what bank is set) $6000 $6002 $6001 (mask: $E003) Top Gun 00000000 00000000 10110011 Air Wolf 00000000 00000000 01111011 Simk Worm 00000000 00000000 10111111 Gun Nac 00000000 00000000 01110111 abcdefgh |||||||+- 1=block further writes to those regs |+|+|++-- PRG +-+-+---- CHR | CHR-A | PRG-A | 111111111 | 111111 c | 876543210 dg | 876543 0 | e######## (256kB) 00 | ###### (512kB) 1 | ea####### (128kB) 01 | f##### (256kB) 11 | fb#### (128kB) # - comes from MMC3 10 | #b#### (weird 128kB)

Cart name		Notes for chip search: Use "+" as delimeter for all fields (except "cart name", where space is used); if many values are entered, all of them must appear in the cartridge then; case is not sensitive "Mapper" is the actual mapper used by this cartridge hardware (might not match the one at wiki.nesdev.com, as at the moment I was analyzing this cartridge, there was no mapper assigned to it, so I had to assign my own number for testing) "Original mapper" is the mapper used by licensed version of this game (for multicarts, it refers to mapper of the inside games, so 0+2 means this cartridge can run NROM+UNROM games) Order in which you put values doesn't matter (you can write 7400+74138+7400 or 7400+7400+74138 to search for a cartridge that contains at least two 7400 chips and one 74138 Some chips (like PAL168) appear in cartridges as 16V8 or 16L8, so be sure to check both posibilities Same goes for memories - type 27F080 to search for 32 pin memories, 27512 for 28 pin with two chip enables or MASKROM_1M_DIP28 for 28 pin with one chip enable Same goes for mappers - some examples: AX5904(MMC1), AX5202P(MMC3), PT8154BM (9112MMC3), AX5208C(VRC4), 23C3662(VRC2) Good news is that you can use wildcards, so 74139+MMC3* will search for any cartrige that has at least one 74139 and MMC3 chip in any version
Mapper#
Original mapper#
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