18 Aug
2008
18 Aug
'08
6:11 a.m.
> 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.
You are remembering correctly - they are not.
*But*, you could read the tape one way, flip it _and_
read it
backwards. Syncing up the two passes is just an exercise for the
student ;-)
Yes, but you have to flip it end-for-end, not side-for-side, and then,
each row of holes is read with the same sensor on each pass. This
means that it won't help a bit with the "dead phototransistor" problem.
What I'm more worried about is a spare bulb -
[...] modern
substitute?
High-brightness LEDs? Very very far from original, but if you value
working over original....
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