On Sunday, November 24, 2019 at 5:33:08 PM UTC-8, Paul Drahn wrote:

On 22/11/19 12:35 pm, wrote:

Â*Â*Â* I understand that the decompiled ladder will noit have mnemonics
but maybe I can decipher it anyway.


Just be aware that sometimes trash is included in EPROMS to stop what
you are trying to do!

Three things to look out for:
the ordering of the data bits can be scrambled; probably you can trace those to the CPU pins
the ordering of the address bits can be scrambled, and some may be
hard to trace to the CPU pins
the data and/or the address might go through inverting transceivers, which changes
the bit-is-a-one /bit-is-a-zero identity.