From: Nicolas Welte (welte_at_chemie.uni-konstanz.de)
Date: 2002-07-11 15:04:48
Hársfalvi Levente wrote: > I seem to remember some book mentioning that it's actually possible to > read whole halftracks, even if there's also some information on the > adjacent halftracks. There were some rumours about a physically narrower > read head in the 1541s. That's probably true. If you look at the r/w head, it has a pattern like a fork with two prongs: the inner part is the r/w coil, and the outer parts (the prongs) are the erase coils, they erase parts of the two adjacent halftracks as well. I think I once tried to read MFM disks formatted with 80 tracks on the 1570/1571 and it worked quite well. At least I could read the directory without problems. Since the MFM burst commands are pretty useless for 80 track disks, I would've had to write my own head positioning code for the drive. Nicolas Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing list
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