<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">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. <br><br><div id="AppleMailSignature">Sent from my PDP-7 Running UNIX V0 expect things to be almost but not quite. </div><div><br>On Mar 7, 2018, at 6:13 PM, Henry Bent <<a href="mailto:henry.r.bent@gmail.com">henry.r.bent@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">On 7 March 2018 at 14:30, Phil Budne <span dir="ltr"><<a href="mailto:phil@ultimate.com" target="_blank">phil@ultimate.com</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">> >Can the IMP software and the H316 simulator talk TCP/IP to an ehernet card?<br>
<br>
If we had TCP-era IMP code, one could, in theory, but as I recall the<br>
structure of the TCP ARPAnet (net 10) address was that one octet was<br>
the IMP number, and another the port on the IMP, which was severly<br>
limited (four host ports?), and if that limitation was "well known"<br>
you might only be able to attach to four hosts over Ethernet.<br>
<br>
Most often, the system attached to the IMP acted as a router, and<br>
connected to the local internet.<br></blockquote><div><br></div><div>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.<br><br></div><div>-Henry<br></div></div></div></div>
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