What different between 4M x 1bit or 4M x 4bit chips on 4MB DRAM SIMM? \ VOGONS

What different between 4M x 1bit or 4M x 4bit chips on 4MB DRAM SIMM?

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First post, by AiGeekNet

Posted on 2023-11-02, 14:42

AiGeekNet Offline

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One of my friends said that he has an retro device that can only use a 30pin DRAM SIMM 4MB module with 4M x 1bit parity 9 chips, but cannot normally use a 4MB module with 4M x 4bit parity 3 chips. What is the difference between the two?

Any hardware open source project on github with 4M x 1bit parity 9 chips circuit diagram ? There are several 3 chips project I I have learnt a lot.

Reply 1 of 1, by weedeewee

Posted on 2023-11-02, 14:49

weedeewee Offline

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You'll find more reading here 3-chip vs 9-chip 30-pin SIMMs

I think it was due to the way the refresh is done that the 3 chip simm isn't supported while the 9 chip one works.

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