15 Apr
2010
15 Apr
'10
1:37 a.m.
List,
Just for the "FYI" file, Terak (UCSD Pascal) floppies appear to be
either SSSD 3740 format (FM 77 tracks * 26 sectors * 128 bytes) or
SSDD (Track 0, FM 26 sectors * 128 bytes, not used) 76 tracks * MFM
15 sectors * 512 bytes. The double-density format is definitely
standard MFM, not DEC RX02 (FM headers, "tweaked MFM data).
The MFM format is interleaved 2 to 1 with a one-sector skew per
cylinder.
The FM format is also interleaved 2 to 1 with a 6 sector skew per
cylinder.
For whatever it's worth,
Chuck
(P.S. I wouldn't mind owning a Terak, judging from some of the
program code I've seen).