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brett71 · 28 September 2021, 17:27

Recently, I bought a bunch of AMD 27C400's off eBay from two different sellers, both from China, and the chips were all pretty much identical, i.e. came from the same source. I've had these sitting on the shelf for a while, and only was until last night that I cracked out my TL866 that I bought after I got the 27C400's and plugged in an adapter board that I made a couple of weekends ago. I suspected these chips were probably re-marked, I confirmed this was the case after watching a YouTube video on how to pull the Chip IDs out of the ROM's.

The Chip ID for these Chinese AMD 27C400's came back as "00c2 b800" instead of "0001 009d" which is correct for the AMD ROMs. The ROMs I actually have appear to be MX 27C4111's. I'm assuming this means it's in the MX 27C4100 line, perhaps a newer revision?

The question I have is: Are the MX 27C4100/4111 chips equivalent to the AMD 27C400's?

28 September 2021, 17:27	#716
brett71 Registered User Join Date: May 2010 Location: Ames, IA, USA Posts: 521	Recently, I bought a bunch of AMD 27C400's off eBay from two different sellers, both from China, and the chips were all pretty much identical, i.e. came from the same source. I've had these sitting on the shelf for a while, and only was until last night that I cracked out my TL866 that I bought after I got the 27C400's and plugged in an adapter board that I made a couple of weekends ago. I suspected these chips were probably re-marked, I confirmed this was the case after watching a YouTube video on how to pull the Chip IDs out of the ROM's. The Chip ID for these Chinese AMD 27C400's came back as "00c2 b800" instead of "0001 009d" which is correct for the AMD ROMs. The ROMs I actually have appear to be MX 27C4111's. I'm assuming this means it's in the MX 27C4100 line, perhaps a newer revision? The question I have is: Are the MX 27C4100/4111 chips equivalent to the AMD 27C400's?