Speaking of
the PC-04 Paper Tape Reader/Punch, I have one for my PDP
8/e system, but one of the ten phototransistors in the monolithic
array is shorted, making it pretty useless for reading tapes.
Read the tape, flip
it upside down, read it again, flip the bits,
merge.
I'm moderately sure that the paper tape I used back when I had a PDP-8
was not symmetric in the way needed here - the line of feed/timing
holes was not on the centreline of the tape.
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