Quote:
Originally Posted by kaffer
I debugged this for FlashFloppy and the bug is in Ziriax track loader.
For efficient sector scanning it skips 300*2 MFM bytes at the track gap. However this assumes the track is at least (544*11 + 300)*2*8 = 100544 bitcells long.
However a DD track is 100000 bitcells +/- perhaps 2%. Usually drives run a bit slow and you end up with a long enough track, but this is certainly not guaranteed.
Works on HxC because it generates long-ish tracks for ADF (101372 bitcells).
I fixed the track loader to skip 0x11A (=141*2) MFM bytes instead (conservatively assumes track is >= 98000 bitcells) and that works fine for me on FlashFloppy.
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HxC is not wrong (neither Ziriax loader).
Bitcells on Amiga (generated by Paula) is a multiple of CCK.
So in not exactly 2us but (1/7093790)*2*7=1,97356us
In a rotation you have (,200/dur)=101340 cells
