On Tue, Nov 23, 2021 at 11:54 AM Roberto Muscedere <rmusced_at_uwindsor.ca> wrote: > > I did the VICE emulation for this drive and I did go through the disk controller code. Here is what I can decipher from my notes: Thank you! This is a very clear list of what's going on. It seems the FORMAT code is the same ($04) as the OMTI 5000-series but the ASSIGN DISK PARAMETERS code is only similar. I didn't check the others. > I heard stories of a Commodore dealer in the USA which sold higher capacity disks by changing the controller ROM, but I have no verification of it. I heard of this too but have no concrete information. As I understand it, they put in a 20MB drive and twiddled the geometry numbers to max out the filesystem (as you calculated, about 16MB). > If anyone has one of these modified units, I would certainly want to take a look at it so that we can preserve the complete history of this unit. That would be cool to see. -ethanReceived on 2021-11-23 21:00:03
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