> At 01:44 AM 6/22/98 -0700, you wrote:
> >
> >Could someone give me a lecture on 2732 EPROM types?
> >
> >I have an unreleased 2600 game to read in (by lending out my EPROM
> >programmer to the author) and it is labelled:
> >
> >D2732A-2
>
> Generally, all chips labeled 2732 should be able to be read in as a standard
> 2732. The difference lies in the way the chips are programmed. Different
> flavors of 2732s use different programming voltages. Usually, the number
> after the EPROM type is the speed of the EPROM. The speed is indicated in
> milliseconds, and is different from microprocessor speed inasmuch as the
> EPROM doesn't DO anything, but the speed indicates how long it takes for
> the data to become stable once the address lines have been set. It's just
> like memory speed. With that said, I don't know what the 2 indicates :)
> The numbers are usually much bigger, in the 100 to 200 range I believe.
Slight correction...100 to 200 NANOseconds. Still slow by other memory
standards, but fast enough at least to meet the 2600's bus speed which is
about 800ns per cycle. :)
I forget the exact difference, but I *think* a 2732A has a 12V programming
supply, vs. 21v or 25v on standard 2732 chips. But as other here have
mentioned, for reading purposes, a 2732 is a 2732. Just be sure the speed
is faster than whatever is trying to read it!
-Chris
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