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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
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tdi7777

3 Posts
Posted - 09/04/2025 :  01:41:01  Show Profile  Reply with Quote
Hello , I'm trying to write on an 87c257 but it's not working.
"write failure, address = 0X000002, Buffer=02"
a priori the addresses are locked .
data 87c257 = The 87C257 incorporates latches on all address inputs to minimize chip count, reduce cost, and simplify design of multiplexed bus systems.
Is there a way to write? GQ-4X4
I tried to copy several 87c257 eproms without success.
Thank you for your help.
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