On Tue, Jun 18, 2019 at 12:35 PM André Fachat <afachat_at_gmx.de> wrote: > I did some worl on these drives recently... > > I THINK you can just use the 8250 board as reference. It is a universal > digital board and is supposed to be jumperable to 4040 mode. Hi, Andre, Good point. Thanks for mentioning this. I'll check those pages in a bit. > As for the analog board you could cross compare the 2031 and 4040 and 8250 > analog boards, or even the apple ii disk ii board as they use the shugart > sa390 as well. I haven't looked at the 2031 schematics (I have a 2031LP but that's just a 1540/1541 with an IEEE interface) so that's also something to look into. Apple, like Commodore, used the SA390 mechanism but used their own PCB (with a 20-pin digital interface back to the Disk II card in the Apple II) that connected to the raw 34-pin connector in the drive, like the Commodore Analog board does. At a functional circuit level, I'm sure there are a lot of similarities between the Apple and Commodore analog boards since the drive is the same. I need to look into how the CBM digital board rolls the stepper lines to see if it's easier to inject those directly into the Shugart analog board (past the step/dir lines on its external 34-pin connector) or to convert S0A/S1A/S0B/S1B and -MTR 0 into Shugart interface signals (step/dir and motor on) Thanks, -ethanReceived on 2020-05-29 21:57:55
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