eprom for replace sm1

pier

Crazed MVS Addict
Joined
Jan 24, 2020
Posts
139
Hello, once i red a forum member who used a 27c020 to replace a broken sm1 but 27c020 hasn't same sm1 pinout. did someone remember the schematics that he used?
 

Misos

New Challenger
Joined
Aug 17, 2018
Posts
57
I have a MV1fz with a NEC Eprom on ths SM1 slot, it uses a 27c301, you could try this one.
 

pier

Crazed MVS Addict
Joined
Jan 24, 2020
Posts
139
I have a MV1fz with a NEC Eprom on ths SM1 slot, it uses a 27c301, you could try this one.

Thank you for your answer. I have some issues because sm1 has same 27c1000a pinout as i can read on neogeo wiki , but the 27c301 ha pin 2 and pin 24 swapped. i also noticed that 27c1000a has same 27c010 and 27c020 pinout.

EDIT: i build an adapter to swap pin 2 with 24 but unfortunatly the sm1 unresponsive error persist. :\
 
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