27 Jan
1999
27 Jan
'99
8:16 a.m.
Jim Strickland <jim(a)calico.litterbox.com> said:
This tape wasn't new when I used it - it was a
leftover vms patch tape from
the 4.whatever world. Now it was recorded at pretty low density - 1200bpi,
if memory serves) but I would have expected it to have many more problems.
1200bpi would be a bit wierd.
Actually, the standard 7 and 9 track tape densities were something like:
Tape Density Encoding method DEC Tape Drive
200BPI (NRZ?)
556BPI (NRZI?) TU10?
800BPI NRZI (Non-Return to Zero Indescrete) TU10/16/TE10/16
TU45/77/TS03?
TS04?
1600BPI PE (Phase Encoded) TE16/TU45/TU77/TU78
TA78 TS11
3200BPI
6250BPI GCR (Group Coded Recording) TU78/TA78
I'm not sure if the TU10 went to 200BPI or 556BPI... Those were old old
densities from early IBM stuff. I am also unsure of the TS03/04's.
There were other machines like the Cipher 880's that did 3200BPI
and 1600. DEC used one as the TSV05.
Bill