Jim Brain wrote: > I'm now less concerned about demand for such an adapter, Very nice! As well as replacing broken chips, an adapter with programmable ROM part would be useful for anyone who has a working drive with an early DOS version. I had 2-3 drives of the 3040/4040 variety which were equipped with DOS 1, how odd it might sound. I found in order to upgrade, one needed to replace both the ROM chips and the RRIOT. We discussed this at the Vintage Computer Forum and came to the conclusion some adapter boards were needed, where I could plug in the old 6530 and a small EPROM just like it is done on the 8250LP. Also it appeared 2532 EPROM's are not suitable replacements for the 2332 (?) ROM's in the drive. They work fine in a PET computer though, just not in the drive? We checked the pinout and saw some references on pinball repair sites about them having the same problems replacing ROM with EPROM, so perhaps this is a real problem and not just me failing to program them properly. Most of this however are moot points now as I have traded away the drives to other people. Of course they might want to make the DOS upgrade later on, but then there needs to be a solution to the ROM replacement. Would Jim's ROM-el work or is that only for 8K chips and upwards? Best regards -- Anders Carlsson Message was sent through the cbm-hackers mailing listReceived on 2011-08-10 08:00:13
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