On 7 March 2018 at 14:30, Phil Budne <p...@ultimate.com> wrote: > > >Can the IMP software and the H316 simulator talk TCP/IP to an ehernet > card? > > If we had TCP-era IMP code, one could, in theory, but as I recall the > structure of the TCP ARPAnet (net 10) address was that one octet was > the IMP number, and another the port on the IMP, which was severly > limited (four host ports?), and if that limitation was "well known" > you might only be able to attach to four hosts over Ethernet. > > Most often, the system attached to the IMP acted as a router, and > connected to the local internet. >
There are drivers in 4.2BSD for IMP interfaces, the ACC LH/DH and the DEC IMP11-A. These are set up to use TCP/IP but it is unclear to me how much work the board does vs. what is expected of the IMP itself. As far as I am aware there is not technical documentation for either of these boards, but if that turned up I imagine they could in theory be added to SIMH for the VAX and PDP-11. -Henry
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