Early 360 machines (Was: Front panel switches - what did they do?)

Jon Elson elson at pico-systems.com
Wed May 25 20:09:24 CDT 2016

On 05/25/2016 02:51 PM, Chuck Guzis wrote:
> I have a related question.  All of the S/260s that I've seen had 2400
> series tape drives.  But my "green card" makes reference to 729 drives
> as well.  Does anyone recall them being installed on a S/360 system?
> --Chuck
Well, the early 2400 tape drives had a VERY simple 
interface.  The read amps delivered raw analog signals to 
the controller.  The write amps took 9 digital signals from 
the controller.  There were also forward, reverse, rewind, 
write gate and EOT/BOT sensors, and unit select.  VERY 
simple interface at the VERY lowest possible level.

I can easily imagine the 729 series of drives may have had a 
very similar interface.  So, it may be possible that these 
could be interchanged fairly easily.


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