Is the protocol used by the DOS Laplink software publicly documented?

I seem to remember there were Linux tools that could use it.

I cannot find anything useful on their website.

  • 1
    Are you sure it is the laplink protocol or was it just the laplink cable?
    – cup
    Commented Jun 27, 2021 at 15:20
  • Probably just the name tldp.org/HOWTO/pdf/Serial-Laplink-HOWTO.pdf
    – Tomas By
    Commented Jun 27, 2021 at 15:22
  • 3
    This suggests that different versions of Laplink used different protocols, and the timing seems to depend on system speed. One way to find out would be to reverse-engineer the Laplink binary.
    – dirkt
    Commented Jun 27, 2021 at 19:54

1 Answer 1


As far as I’m aware, it isn’t.

I don’t remember any Linux software capable of connecting to LapLink; the latter was commonly mentioned because the cable provided with it could be used with a variety of tools. DOS-to-Linux connections with null-modem cables usually involved PLIP, SLIP or PPPD rather than LapLink-style tools.

  • Laplink was (ab)using the parallel port for standard higher speeds afair. Commented Jun 30, 2021 at 17:45
  • @RuiFRibeiro PLIP does the same, but unfortunately not in the same way.
    – tofro
    Commented Jul 24, 2021 at 12:46

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