recovering cartridge tapes (was: Tek fiches found!
mcguire at neurotica.com
Mon Jul 19 18:03:23 CDT 2010
On 7/19/10 6:37 PM, Chuck Guzis wrote:
>> This is similar to the 9/7-track reading device: there are no takeup
>> and feeder reels as they are normally present in a working drive. The
>> tape is not pulled over the read head under tension.
> Do you mean the system used in vacuum-column 7/9 track drives? (I
> think IBM used a pinch roller on either side of the head; CDC used
> vacuum capstans. The tape columns were kept at the appropriate level
> by a photocell system, with each reel motor activated as necessary to
> keep an adquate supply of tape in the columns for buffering.
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'.
Port Charlotte, FL
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