William Levak wrote: > The 2040/3040 has 20 sectors on tracks 18-24. The 4040 has 19. The > reason given for the change was that 20 sectors did not leave enough of a > gap between the last sector and the first one. I actually do have a few disks in DOS1 format, as the first disk drive we used at school way back was a 3040. I tried to modify the VC1541 ROMs to be able to at least read the 670 blocks, but, to be honest, I don't remember whether it worked. I think I did it by simply modifying the DOS table with the numbers of sectors. Also I wanted to add 3040 emulation in VICE, but I had problems with the 6530 emulation. VICE does not emulate the GCR processor (6504) directly, but only the interface to the "big" drive CPU (the 6502). As far as I know there is no hardware difference between 3040 and 4040, but I did not manage to analyze the comms between the two processors enough to be able to emulate the GCR processor :-( As far as I remember the 3040 emulation is not in the menu, but you should be able to enable it from the command line (on Unix at least). I assume the difference between 2040 and 3040 is the same as e.g. between the 2008 and 3008 - the numbering that I think was different between US and Europe. Andre - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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