3 ms·

I believe this was pioneered by Laplink[0]. [0] https://en.wikipedia.org/wiki/Laplink https://en.wikipedia.org/wiki/Laplink

• b3lvedere 1y ago
  Yup. Used to use this a lot in the DOS era. Copying files between LPT or COM ports. Slow, but worked without too much hassle.
• genewitch 1y ago
  or [x|z]modem ?