Strange magtape anecdote

jim stephens jwsmail at
Tue Oct 27 03:48:26 CDT 2020

On 10/26/2020 10:50 PM, nico de jong via cctalk wrote:
> IBM 360/40 with 4 tapedrives.
the 3420 drives and I suspect their predecessors which were more common 
on the 360s used
one light bulb to run the light from one bulb all over the drive.

The 3420's we had had a big box of spaghetti tubing which were the light 
pipes to service our
  drives.  I had the box somewhere when we shut down.  The 3420s and 
3803 went one way,
the most of the service spares were abandoned.

There were a lot of weird problems with light sensors on those drives.  
We had some on our
360/50 at UMR as well, but the 2314 disk drives were more entertaining 
with hydraulic failures.


PS: when googling ran across this site using an interesting graphic with 
interesting peripherals.

PPS:  2420 drive reference page for that half inch drive.

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