IMP
larsbrinkhoff opened this issue · 3 comments
larsbrinkhoff commented
Hello,
If you consider adding some IMP functionality, I'd like to be involved peripherally.
I have ITS using an IMP interface as part of a KA10 simulator for SIMH. And also a work in progress to emulate the IMP software in a standalone C program.
charlesUnixPro commented
On Fri, Oct 5, 2018 at 12:03 AM Lars Brinkhoff ***@***.***> wrote:
Hello,
If you consider adding some IMP functionality, I'd like to be involved
peripherally.
I have ITS using an IMP interface as part of a KA10 simulator for SIMH.
And also a work in progress to emulate the IMP software in a standalone C
program.
The IMP code uses udplib for IMP-to-IMP communications; I added code to use
udplib for IMP-to-host communication.
My goal was to restore ARPAnet functionality to Multics by adding the
"ABSI" device to the dps8m emulator, with partial success. (I have not
implemented the "ready" bits; because udplib is connectionless, some kind
of heartbeat is needed tithe the ready bits wired to a heartbeat timeout,
or some similar scheme.)
It turns out that too much of the Multics ARPAnet software is missing; work
has started on recovering some backup tapes that may contain the missing
pieces. (It was an unbundled product, as was TCP/IP support, so currently
Multics does not support any network connectivity other then modem
emulation with TELNET.
So at this point IMP support is on hiatus pending reconstruction of missing
Multics software.
…-- Charles
larsbrinkhoff commented
Yes, I understand this is some distance into the future. Just a heads up.
In my vauge reasoning, I was thinking the IMP-to-IMP dedicated line might have been implemented as a TCP connection. But UDP would work too. Any particular reason you chose one over the other?
charlesUnixPro commented
On Fri, Oct 5, 2018 at 10:59 AM Lars Brinkhoff ***@***.***> wrote:
Yes, I understand this is some distance into the future. Just a heads up.
In my vauge reasoning, I was thinking the IMP-to-IMP dedicated line might
have been implemented as a TCP connection. But UDP would work too. Any
particular reason you chose one over the other?
I was using the existing SIMH based IMP code; it uses udplib for IMP to
IMP; the IMP to host connection was unimplemented.
…-- Charles