🚀 go-pugleaf

I have a little problem with megabit-EPROMs:

Are there any differences between 27c010-120 and 27c020-150 other than:
- double memory
- higher access time  ?

I was trying to replace the 1Mbit Eproms with 2Mbit, but the system does not
recognize the chips at all. At least, when I am trying to read from the 
2Mbit Eprom the system acts as if there was no chip at all.

_BUT_ when I used another chip with a different software on, there seem to be some bits
that can be read. Otherwise it appears similar to the other chip.

BTW, my prommer works fine with those 2Mbit chips. It recognizes them, writes to them, and
reads with _no_ error at all.

What is the problem?


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