From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2007-01-09 21:06:32
On Tue, Jan 09, 2007 at 06:07:27PM +0100, Nicolas Welte wrote:
> Now when I had another look, I remembered a strange story someone told me.
> He replaced a 2332 with a 2532 in a SuperPET, and the 6809 CPU wouldn't
> work, because the 2332 has two CS inputs, but the 2532 only one! So guess
> what, same thing in the 4040! Both inputs used! So I added a circuit to the
> drive and now it can also use 2532 EPROMs. Two RAMs were also damaged,
> after I changed them the drive is alive again :)
>
> I made some pictures of the modification:
> http://freenet-homepage.de/x1541/temp/im000048.jpg
> http://freenet-homepage.de/x1541/temp/im000050.jpg
Neat! You could have saved me some time by telling where you added the
circuit. Am I right that you installed a socket and a chip to the lower
right corner, right of UB2? It's neat that all required signals were
available nearby. Was it a completely empty socket (only Vcc and GND
connected)? It's a pity that the consumer-grade Commodores did away
with this practice of having some prototyping area (or place for fixing
hardware bugs).
Marko
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