28 Dec
2009
28 Dec
'09
3:40 a.m.
--- On Sun, 12/27/09, William Donzelli <wdonzelli at gmail.com> wrote:
Yes, 2732s (and below) are still easy to get - even
for
free. I may
still have a bunch, unless Ian has culled them out of my
EPROM box.
Hehe. Nah, you still have quite a few in there. Which reminds me, you really should take
this box of EPROMs back, lest they all find their way into my projects. Some of them are
looking nervous.
Now 2704s are a different story. I found a board with
a few
of them
digging thru all this CDC stuff. Of course I had to rescue
them...
Good point. *Those* are very rare. I really should try to talk you out of one of those,
just so I can say I have one. If I was ever working on any hardware that used those,
I'd simply build an adapter and use part of a 2732 or something. That's the nice
thing about EPROM chips - even if you don't have the right one, it's usually not
that big a deal to use a more common chip and tie the unused address lines to ground.
The only annoying thing is on the other side of the spectrum - needing a bigger chip.
Lately I've been working with hardware that requires much larger chips, and 16 bit
wide ones at that. 16 and 32 megabit EPROMs are out there, but aren't nearly as easily
scavenged as, say, 27512's are.
-Ian