27 May
2000
27 May
'00
9:52 a.m.
> This is a good start. The header should include a
byte that contains a
> flag indicating the status of the sector (good, bad, etc).
Other things that are 'missing' from that
header are whether the sector
is single or double density, what sort of Data Marker came before it
(some TRS-80 disks use strange data markers, and just about all TRS-80
M1/M3/M4 OSes use deleted data markers on the directory track).
Then there are some *real* oddballs, such as disks with 18 or 12 or 9
bits per byte.
It's very, very common for double-density CP/M disks to have the boot
sector - and in some cases the first few tracks - in single density.
For these odd formats, I just record the waveform from the head
for each track for a couple of revolutions, just to make real
sure that I'm not missing anything :-).
Tim.