Quote:
Originally Posted by Timbucus
That is really clever - by remove the PROMS I assume you mean some form of digital switch that takes them out of the memory map temporarily while using the reader?
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It could be temporary I guess, though that needs some way to disable the chip enable so might mean hacking the board or lifting IC legs. On the z80 I used ram with battery backup, no rom, in bootstrap mode read from ram is disabled but write to ram and io is still enabled. If the code to be loaded doesn’t use any routines from prom then they could just be removed.