IMP system software
sethm at loomcom.com
Thu Oct 1 15:06:47 CDT 2009
On Oct 1, 2009, at 11:48 AM, Brad Parker wrote:
> Seth Morabito wrote:
>> I think I asked about this several years ago, but I thought I might
>> try my luck again.
>> Is anyone aware of any surviving ARPAnet IMP System Software, in
>> any form?
> After talking with a person from BBN it might be possible to read
> some old 7-track tapes with some code on them. Apparently the
> earliest versions were written in PDP-1 assembler with macros.
> Later a cross compiler was written for TENEX.
That is some potentially very good news! Thanks for asking about this!
> I'll dog it for a while and see what happens. I suppose the next
> question is, "does anyone have docs on the Honeywell 516"? and
> is there a simulator?
There is not (yet) a 516 simulator, but Bob Supnik's SIMH does have an
H316 simulator. See: http://simh.trailing-edge.com/h316.html
Later IMPs were H316s, so possibly some of the code on those 7-tracks
is written for them?
I have no idea how much work would be involved in adding a 516 mode to
SIMH, nor how hard it would be to simulate the bit-serial IMP-host
interface hardware, but I'd certainly be game to help with that.
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