19 Jul
2010
19 Jul
'10
7:16 p.m.
On 19 Jul 2010 at 19:03, Dave McGuire wrote:
Every vacuum-column drive I've seen has used
pressure sensors to
determine the position of the tape loops within the columns. Granted
I've not seen a HUGE variety of different drives, but...just sayin'.
Take a look at the bitsavers archive for the CDC 606 tape drive. 2
photosensors per column. (page 1-6). The 60x drives were marvels of
engineering and built like tanks.
--Chuck