Namco System 12 64mbit sop44 mask reading

[Tailsnic Retroworks]

Hi. I'm trying to repair a Fighting Layer original board, and I suspect one of the main data mask roms is broken. So I want to know what is the model of the memory for reading it, and if broken, what replacement to search.

 

[chacal231077]

Hi. I'm trying to repair a Fighting Layer original board, and I suspect one of the main data mask roms is broken. So I want to know what is the model of the memory for reading it, and if broken, what replacement to search.

Thread 'Namco System 12 Change Region' https://www.arcade-projects.com/threads/namco-system-12-change-region.13247/

29f016a-90pftn

 

[Tailsnic Retroworks]

Thread 'Namco System 12 Change Region' https://www.arcade-projects.com/threads/namco-system-12-change-region.13247/

29f016a-90pftn

Sorry, I think you have misunderstood me. There are 3 main data roms that are masks, and their size is 64mbit sop44 format.

 

[chacal231077]

On the Romboard ?

 

[Tailsnic Retroworks]

On the Romboard ?

Yeah

 

[Tailsnic Retroworks]

Can someone confirm me if the 64mbit sop44 mask roms of Namco System 12 games are pin compatible with the ones used in Naomi cart conversion, 26L6420?

 

[Tailsnic Retroworks]

Hi, so much time has passed, so I can confirm the 64mbit mask roms Namco System 12 games use are 23C6410/23C6411, with BYTE signal tied to HIGH (Word Mode, 16bit). So, is perfectly feasible a replacement of these masks with the famous 26L6420 with 3.3V voltage regulator on VCC and WE pins.