[GreenKeys] Photoelectric keyboard & distributor - M28 Compact

[Harold Hallikainen]

>  I am also looking for specifications 50546S and 50547S which cover how to
> convert an AN/UGC-20 to photoelectric operation like the UGC-77.
> The mod kit is Teletype 334438 (Navy MK-1625/U)
> The Navy numbers for these specifications are
> NAVSHIPS 0967-LP-438-8010
> NAVSHIPS 0967-LP-438-8020
>
> You can see the UGC-77 photoelectric mechanism at
> http://www.navy-radio.com/tty/ugc77.htm
>
> cheers,
> Nick England K4NYW
> www.navy-radio.com


Photoelectric tape reader reminds me of the punched tape reader a friend
had for his Imsai computer. The reader had 9 photodetectors, the 8 bits
plus the feed hole. The feed hole is typically smaller than the data
holes, so it provides a strobe pulse in the middle of the data pulses.
You'd pull the tape through by hand. I always thought that was very
clever.

Harold



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