--- Daniele Gratteri <daniele_gratteri@inwind.it> wrote:
> Can this link:
> http://hero.dsavage.net/robots/Hero1/buildit/Hero1_RomUpg.html be useful to
> you? It mentions the 68764 and how to make a 2764 work like that, if I
> didn't misunderstood any. Who knows.
I think that's the idea. Nice find.
> I went to the best electronic shop of my city and I didn't find the 68764:
> they're obsolete parts :-(
I have been burning PROMs and ROMs for 20 years. I've _never_ seen the 68764
in any circuit I've seen at work or home. It's not only obsolete, but rare.
Mostly, people took the 2716->2732->2764 route. Commodore took a slightly
different path (2716->2532...) because of the pin differences with the 23xx
mask-programmed ROM series.
I remember getting 4K EPROMs burned for extra utilities for my PET (32K,
BASIC 2.0) and how hard it was to find 2532 chips that fit the motherboard
without buying a Skyles or other brand of ROM adapter. I've saved every
2532 I've seen since (about 6 ;-)
-ethan
-ethan
=====
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