Mystery system

Jon Elson elson at
Thu Feb 4 23:30:43 CST 2016

On 02/04/2016 11:22 PM, Chuck Guzis wrote:
> On 02/04/2016 08:25 PM, Jon Elson wrote:
>> On 02/04/2016 08:57 PM, William Donzelli wrote:
>>> Some models of 3420s were 7 track.
>> Yes, I suppose there was a need in some installations to 
>> handle old,
>>  archival tapes.  But, I certainly never saw one.  Most 
>> sites got rid
>> of their 7-tk stuff as soon as they could.
> Some 6-bit systems hung around for a very long time.  E.g. 
> CDC CYBER 170/180.  7-track drives for those never really 
> went out of fashion until well into the 1980s.
> Here's a 1981 CW article that specifically mentions the 
> CDC 667 in the drive inventory of McDonnell Douglas 
> automation.DP center:
I was there on a tour, a few years earlier.  I think they 
still had the model 195 at the time.
A vast facility filled with big blue boxes.  The basement 
had so many 415 Hz UPS's that you had to stick your fingers 
in your ears.


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