IIRC the imp11-a is built from a dr11-b with some custom interface logic to talk to the 1822 (thinking about it it was maybe 2 back to back I’ve forgotten) but from a SW stand point the registers are what is exposed by the dr11. Although the CSS folks may moved the default addresses. At one time I had small document from css on it. Ill have to do digging.
Sent from my PDP-7 Running UNIX V0 expect things to be almost but not quite. > On Mar 7, 2018, at 6:13 PM, Henry Bent <henry.r.b...@gmail.com> wrote: > >> 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 > _______________________________________________ > Simh mailing list > Simh@trailing-edge.com > http://mailman.trailing-edge.com/mailman/listinfo/simh
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