Nicolas Welte wrote: > Maybe I could, but it makes no sense: I have a box of disks and I don't > know which ones are single and which ones are double sided. I had to > modify it in a way that it detects the disk type and then uses 77 or 144 > tracks. So you´re probably best of with a program that reads sector 38/3 (or so, the second BAM block) and sees whether it points to track 38 (8250 format) or 39 (8050 format), and depending on that resets the drive appropriately. > What makes you think so? Today I also got a SFD1001 and I also thought > that it's misaligned: It can't read the disks that came with the 8250. > But it formats disks just fine, and reads them back in. BUT: The 8250 > also reads this disk (at least the dir). And even a freshly 8250 > formatted disk won't work in the SFD. This is very strange... Yes indeed. As I said, I cannot format disks at the moment, so I cannot test much. My single 8050 disk is read in the 8250 without problem in both drives, but the 1001 chokes on it. > So far it worked fine for me with the cheaper disks. I have some QD > disks (they don't say QD, but 2S/2D 96tpi, which should be the same) > which I got from the University trash, and they're formatted in CBM DOS > 1 format (670 blocks free)! If you like some to make experiments with > ;-) If you could part with two or three, that would be nice! Somewhere I have a patched VC1541 ROM where I tried to make it use the DOS 1 format - I tried it with my 6502 emulator from my selfbuilt computer, but don´t remember the outcome. That reminds me: Did anyone try to replace the 1MHz I/O and CPU with 2MHz components and patched the ROM to work in 2 MHz? I once tried it (with an IEEE488 interface, so no serial IEC timing troubles) but did not succeed... Andre -- Email address may be invalid. Use "fachat AT physik DOT tu-chemnitz DOT de" ------Fight SPAM - join CAUCE http://www.cauce.org------Thanks, spammers... Andre Fachat, Institute of physics, Technische Universität Chemnitz, FRG http://www.tu-chemnitz.de/~fachat - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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