Anybody live in Chile?

Tore S Bekkedal toresbe at
Mon Sep 12 08:26:05 CDT 2005

On Fri, 2005-09-02 at 18:25 -0500, Scott Stevens wrote:
>  I wouldn't call vacuum column drives an icon of EARLY
> computers...
I quote "IBM's Early Computers", by Bashe, Johnson, Palmer, and Pugh, an
excellent book well worth reading:

"...the Type 726 tape units used in the 701 computer system, produced in
1953. They operated at 75 ips, with a tape-recording density of 100bpi."

and as this picture shows, it was vacuum-column.

I believe the UNISERVO tape drive on the UNIVAC didn't use vac cols, but
then again... the tapes were metal.

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