Ghouls'n Ghosts US 1st rev. PPU issue ? (SOLVED)

PCB problems and fixes
Layer
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Re: Ghouls'n Ghosts US 1st rev. PPU issue ? (SOLVED)

Post by Layer »

Indeed, RAM and ROM checks on CPS hardware seem to be incomplete. GnG ROM check gave all the roms as OK.
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leonardoliveira
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Re: Ghouls'n Ghosts US 1st rev. PPU issue ? (SOLVED)

Post by leonardoliveira »

Asayuki wrote:I'm glad you solved it! Congrats!
As this didn't get caught by a ROM check, it means the contents of this memory are probably not accessible by the cpu.
Which also makes me think on how the map of tiles for each level gets read directly in hardware without cpu intervention. Interesting design.
Capcom boards can only self test the CPU ROMs. So memory tests will only test CPU accessible RAM and ROMs.
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Layer
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Location: France

Re: Ghouls'n Ghosts US 1st rev. PPU issue ? (SOLVED)

Post by Layer »

I noticed Gfx rom 19 is not in Mame, it has 1 byte diff. All the other Gfx roms are matching Mame.

https://mega.nz/#!pgFEVSaC!FLO6W0shLXey ... i59jo8qEyk
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