14 Jan
2020
14 Jan
'20
11:25 p.m.
I built a paper tape reader at one point, lord knows were it is. It's
pretty easy -- Two pieces of wood to hold the paper with a mm or 2 shaved
off the bottom of one of them the width of the paper tape. Then 9 parallel
holes and put optical transistors connected to a 5 volt supply via a series
resistor, running into a parallel port the 4th one is used as a strobe to
pick of the 8 data bits and small light bulb on the other piece of wood.
You then just pull it through and its self strobing. Set up a cat <
/dev/parallel > /tmp/foo
Your basically done, you'll need to pick reasonable values for the
resistors to that match your transistors to switch on/off if the light
passed through the hole. I've forgotten what I used, it something I had in
the parts box.
On Tue, Jan 14, 2020 at 12:16 PM Lars Brinkhoff <lars(a)nocrew.org> wrote:
Jon Steinhart wrote:
I have a copy of double-sun space war (sorry,
just the binary) for the
PDP-15/GRIN-2 on DEC fan-fold paper tape with the boot loader written
in octal on the leader. Not sure if it's of any use
I'm very interested in this! Is the paper tape readable somehow?