Repair cps1

[ramosribeiro2000]

Can you dump the original ROMs and compare their checksums against MAME?

From what I'm seeing in your screenshots, I still suspect one of the PAL chips has gone bad.

Could you tell me on the board which chips would be?

 

[ShootTheCore]

 

[ramosribeiro2000]

so there are only 3 and not 5. show me in the picture which are the two files?

 

[ramosribeiro2000]

I tested these 3 on the other board and they worked. I think the problem is roms 1-8 and 10-13.

 

[ShootTheCore]

You are correct - there are 3 PAL chips instead of 5. I corrected my earlier post.

Glad that you confirmed that the PAL chips are good. With the graphics ROMS, are you using 27C400 chips?

 

[ramosribeiro2000]

Você está correto - existem 3 chips PAL em vez de 5. Eu corrigi minha postagem anterior.

Que bom que você confirmou que os chips PAL são bons. Com os ROMs gráficos, você está usando chips 27C400?

You are correct - there are 3 PAL chips instead of 5. I corrected my earlier post.

Glad that you confirmed that the PAL chips are good. With the graphics ROMS, are you using 27C400 chips?

how to use romident to know which ROM is defective? Which one should I buy from the photos below?

 

[ShootTheCore]

Buy the second one - AM27C400-105DC.

Here's how to use romident to check that the ROMs are valid:

• Dump each ROM as a 27C400 chip with an EPROM programmer.
• After the files are dumped and saved, place them in the MAME folder.
• Open a command line, go to the MAME folder, and type: mame -romident NAME_OF_FILE
• MAME will tell you what game the ROM matches up with. If it doesn't match any games, or if it matches the wrong game, then that's a bad ROM.
• Repeat for every ROM file you saved.