one method that I could think of would be like some 80's magazines:
print barcodes onto letter paper. Use an old CueCat (the
proprietary-but-much-hacked not-so-free giveaway from Radio Shack) to
read the data back in.
Interesting thought! I do have a CueCat around here somewhere. It's a PS/2
CueCat, but with a little Propeller (uC) board, I could turn that into
serial. It would also need the CueCat decode algorithm (out there on the
Internet somewhere).
Heh, imagine CueCat scanning a bootloader into the PDP-11!
There is no hardware other than what you are likely to already have
for the output side.
True, bar code output is pretty easy; however, I wish I could do it in a
way that was retro-compatible. Punching tape or marking cards is something
I could have done in the 70s/80s, but using a JavaScript website to produce
printable bar codes seems like cheating. Wonder if I could find some old
Epson-compatible bar code printing software for CP/M, etc?
- Earl