scary warning about bubble memory loop mask, TI 763/765 maint manual

Chuck Guzis cclist at
Sat Aug 5 21:40:35 CDT 2017

On 08/05/2017 06:29 PM, Eric Smith via cctalk wrote:

> Bubble memory devices typically have many minor loops, not all of
> which are usable.  TI printed mask data on the label of the bubble
> device, identifying the defective loops.  When a bubble memory board
> is installed or replaced in the terminal, it is necessary to put the
> terminal into command mode and issue a test command to enter the
> mask.

My recollection is that the track data was printed by Intel.  At least
mine came that way.

It always seemed like a solution in search of a problem, given the
power-hungry specialized ICs needed to run it.


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