8 Mar
2023
8 Mar
'23
1:23 a.m.
On 3/7/23 17:04, Zane Healy via cctalk wrote:
I’m working on a project, and I need to know the age
of various tape formats. For example when were 6250bpi 700’ 9-Track tapes or DC600A
cartridges introduced? Is there any good resource online that documents this? Wikipedia
is of some help, but the older you go, the spottier it is
Strictly speaking out of an orifice, I'd suggest that 9 track tapes in
NRZI and PE first came around with the IBM 2400 series tapes, GCR with
the 3400.
Prior to the S/360, tape drives were largely 7 track and used NRZI in
200, 556 and 800 bpi densities (IBM 700 series drives). Of course,
there are many outliers.
As far as QIC-24 (DC600A), the applicable standard dates from 1983.
https://www.qic.org/html/qicstan.html
FWIW,
--Chuck