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While cleaning a storage room, our staff found this tape containing #UNIX v4 from Bell Labs, circa 1973
Apparently no other complete copies are known to exist: https://gunkies.org/wiki/UNIX_Fourth_Edition
We have arranged to deliver it to the Computer History Museum
#retrocomputing
3200 fci is flux changes per inch, so basically the number of bits per inch of tape.
700GP is the style of tape. 1/2 inch, 9-tracks.
The length of the tape depends on the size/diameter of the reel it’s on. Going by the markings on the left it’s about 1000ft of tape.
Well done