Commodore Pet ROM trouble... EPROM Substitutes...

From: RMaxwell_at_atlantissi.com <(RMaxwell_at_atlantissi.com)>
Date: Thu Jul 22 15:30:58 2004

On 2004-Jul-22 13:09:46 Wolfgang wrote:
>
> Mentioned TMS2532 Eproms are one of these Unobtainiums here.
I've had better luck finding Hitachi's HN462532G version here... in Canada.
That may be worth checking for.

> Looking at the Pinouts I have in my databooks there are
> little (minor?) Differences to the standard 2732's (besides
> the different Program Supply Voltage). I couldn't find much
2732 and 2532 program at +25V, 2732A programs at +21V. +25V is fatal to
2732A. Don't ask me how I know that.
> ressources online, but would it work if I made a small
> adapter like "illustrated" below...
>
> 2732 2532
> EPROM -> SOCKET
> Pin(s) Pin(s)
> 1-17 -> 1-17
> 18 (E) -> 20 (PD/PGM)
> 19(A10)-> 19 (A10)
> 20(GVpp)> 21 (Vpp)
No. The 2532 Vpp is always +5V when reading, and would keep 2732 outputs
always OFF. The 2532 has just one enable pin, while the 2732 has two.
Better to tie 2732-20 to 2532-18 (or to GND - outputs would be always
enabled when the chip is selected).
> 21(A11)-> 18 (A11)
> 22-24 -> 22-24
>
> Please correct me, if I'm completely wrong and trying to do
> something impossible.
Impossible? Nothing's impossible. Messy and difficult, maybe.
> 2732's would be easy to obtain, and I have some
> prommer-schematics and software handy. So it would be cool
> if I could use them.
>
> Regards,
> Wolfgang

At VCF East 2.0 I brought along an EPROM programmer and some blank 2532s...
not that you would have considered that to be East at all... ;o)

Best of luck,
Bob
Received on Thu Jul 22 2004 - 15:30:58 BST

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