Well, I dumped all 4 ROMs that I have and they match Zimmer's images perfectly. ***BUT*** These ROMs are programmed with an active-HIGH chip select (pin20), so a 2764 (or even a 68764/6) would presumably need to have CS inverted. I think this issue has also come up in the C64/C128 world somewhere... If he didn't account for that then I'm surprised he read anything at all, not just "substantially different" code ;-). mike ----- Original Message ----- From: "Jim Brain" <email@example.com> To: <firstname.lastname@example.org> Sent: Thursday, April 14, 2011 12:14 PM Subject: Re: 8050 ROM dump > > On Thu, April 14, 2011 10:05 am, Steve Gray wrote: >> This doesn't seem right. Surely commodore used EPROMs while developing >> the >> drives, before they made masked roms. Perhaps it's a matter of selecting >> the correct speed EPROM? Afaik the two CPUs don't access the same rom >> anyway. I'm sure I've seen drives with EPROMs direct from commodore. > > The user contacted me to state that he was able to rig up a way to read > the 2364 onto his programmer. He notes the code is substantially > different from the Zimmers ROMs. I don't have a copy yet, so I cannot > verify this information (yes, it is possible he messed up the wiring on > his reader interface, but I can't confirm either way). > > He notes he cannot continue working on it this week, but will try next > week or so. I will keep the group updated. > > Jim > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2011-04-14 20:00:12
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