Re: [stella] EPROMs

Subject: Re: [stella] EPROMs
From: Chris Wilkson <ecwilkso@xxxxxxx>
Date: Mon, 3 Sep 2001 00:09:49 -0400 (EDT)
On Sun, 2 Sep 2001, B. Watson wrote:

> other things I picked up an EPROM programmer with a 28-pin ZIF socket,


> 2 of the chips I got are labelled `M2732AFI 21V Fast', and appear to be
> brand new. Are these things fully compatible with the standard 2732? I'm
> assuming that EPROMs are like RAM, and will run just fine at a slower
> speed than they are rated, but what about the programming voltage/timings?

Who makes the chip?  There should be a symbol on it someplace.  Maybe even
the company name.  Try to describe it here if it's non-obvious.  2732A is
certainly different than 2732.  The "FI" is just packaging nonsense.  You
can ignore it.  Is your programmer a stand alone model, or does it run with
a PC?  Who makes it?  How do you use it?  Did you get the docs?

> The rest of the chips I got are 27C128's. I assume the C means CMOS. I
> haven't yet found a data sheet for these, but somebody on this list can
> probably give me the short answer: Will these 27C128's (a) work in a
> programmer designed for regular 27xx series, and (b) assuming I get them
> programmed, will they work in a 2600 cartridge? (Yes, I have 74xx inverters)

Yes, 27C128 is great.  Since you have those, I'd recommend using those
for development purposes and leave the M2732A chips alone.  Or maybe save
them for production, etc.  If you need cartridge boards, the 27C128 will
fit the boards I make.

> If I were dealing with modern PC hardware, I'd just take the `try it and
> buy another if you fry it' approach (aka `learning by burning'), but 2600
> consoles are getting hard to come by these days, so I'll the people who
> know...

Better to ask this now than to ask later how to fix the 2600.  :)

> Anyway, if worst comes to worst, I have got one regular old 2732 I can
> use... and the Hamfest trip was a blast, even though I'm not really into
> ham radio.

They're great.  I just wish there were more of them around....


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