WTB 27c400 Eproms

SCUBA King

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Donor 6 years: 2020-2025
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I need 4-6 but would take 10+ if available.
Must be non-Jedec 27c400 40pin, not 4096, 4002, 4001.

I am poking at some F3 daughter cards and the mask roms are pin compatible with 27c400.

DM me with what you have in your stash.

Thanks!
 
I have some nos and unused otp mask roms if you need?
AM27C400-120 OTP mask rom if you need? Last remaining ones in existence so dont waste them! Perfect for replacing mask roms that have failed.
I dont want to waste OTP on this project. Still hoping to find some erasable for testing and putzing with this as I go.
I am 99% sure the mask roms are the problem but still not 100%
I got good checksums consistently, and now all of the sudden when I check again with same settings on my programmer, they are inconsistent and fail.
Something is wrong or has changed. I wanted to pop in fresh burn of each and see if problem goes away.
 
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