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 Message was sent through the cbm-hackers mailing list
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