On 12/8/09, Bill Degnan <firstname.lastname@example.org> wrote: > Would it be useful for me to attempt to extract the DOS board code? I > figured this was already available, but I could grab the machine lang code > and save to disk (I think) and then post on my web site. I may also have a > printout of this drive's ROM, I do know that I have the 4040 drive ROM > assembly code printout in a binder. I am not as experienced as many > members here, at these things but the task of extracting the D9090 machine > code would be a good learning experience for me and I don't mind the > effort. The ROM code is already extracted - quite sometime ago - what I never finished was commented disassembly of it. http://www.zimmers.net/anonftp/pub/cbm/firmware/drives/old/9090/index.html http://www.zimmers.net/anonftp/pub/cbm/firmware/drives/old/9090/300515-revA.bin http://www.zimmers.net/anonftp/pub/cbm/firmware/drives/old/9090/300516-revB.bin http://www.zimmers.net/anonftp/pub/cbm/firmware/drives/old/9090/300517-revB.bin http://www.zimmers.net/anonftp/pub/cbm/firmware/drives/old/9090/300517-revC.bin . . . Now this file... http://www.zimmers.net/anonftp/pub/cbm/firmware/drives/old/9090/harddrives.zip ... is somewhat new to me. I haven't gone through it to see what files might compile into which ROM chip, but if I'm remembering correctly, the SASI command section should be in the 8K ROM P/N 300517, and that's the one that changes how long the format takes (Rev A vs Rev C). The other two ROM images are the CBM DOS portion that speaks to the PET via the IEEE-488 port - it's the "standard" scheme of one CPU handling out-of-box data transfer and command parsing, and another CPU handling the low-level drive functions (done in software in a 1541, but still in hardware for most/all of the IEEE disk drives). Inspecting the source might reveal much - I don't think we had that to look at 10+ years ago when I dug into this issue the last time. -ethan Message was sent through the cbm-hackers mailing listReceived on 2009-12-08 21:00:36
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