At&T Unix PC, Tape drive

Chuck Guzis cclist at
Sat May 2 11:53:45 CDT 2020

On 5/2/20 8:52 AM, Patrick Finnegan via cctalk wrote:

> I think a UNIX PC is a 3B1, not a 3B2.

Yes, the 7300/3B1 was officially the "Unix PC".  My point was that the
3B2 notes say that particular system used the Cipher 525 floppytape and
was 23 MB capacity.   This agrees with what I know about the 7300 tape
drive--it required one to format a tape and was also 23 MB capacity.

I think it's reasonable to suppose that the 7300 also used the Cipher
floppytape drive.

I was speculating that it might also have been possible to interface to
a SCSI or QIC-02 tape drive.

Jon, I've "lost" my car in shopping mall parking lots, but how does one
"lose" a CDC Keystone drive?  :)


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