26 Apr
2015
26 Apr
'15
9:54 p.m.
On 2015-04-26 21:34, Dave McGuire wrote:
On 04/26/2015 03:30 PM, Mark Pizzolato - Info Comm
wrote:
I have very little experience with TOPS-10, and that is only as a user...
Meanwhile, we removed the DEUNA from the simh PDP10 (KS10) simulator since, according to
Timothe Litt, besides his unfinished midnight project, there was never DECnet code
delivered on the KS10 which could use it.
The arplst output suggests you're working with an IP stack here.
Where does the code for this IP stack come from, and what context was it used under?
If useful code exists, I'll be glad to put the DEUNA device back into the simh PDP10
simulator.
It seems to me that, if one can plug a particular board into a slot in
a particular machine, one should be able to do the same with simh,
regardless of what *old* code may or may not support it. People are
writing new stuff for these machines all the time; witness BQT's IP
stack for RSX for example.
I myself have multiple KS10 systems here, and would love to be able to
plug DEUNAs into their Unibus chassis at some point and have it actually
work. DEUNA support in simh would surely be instrumental in allowing
that to happen.
All true and good points.
I'm curious on exactly how a DEUNA/DELUA works in a KS-10. Does anyone
know? Does it do 8-bit-byte DMA to the 18-bit memory, leaving the top
two bits alone. Or does it only work if it do word DMA (would be
strange, as the controller itself can send and receive odd byte length
ethernet packets).
And how does the whole controller actually work in a KS, since the
controller expects there to be control structures in memory, which are
used to manage the buffers. Those are expected to be 16-bit fields at
one address, and an additional 2 bits of address in another word.
Is there some potential problem with regards to a PDP-11, which have two
parity bits for data, which are used for actual data on a KS? (If I
remember right.)
In short, this is not trivial, and if it works on a real machine, the
emulation needs to reflect that truthfully, or else it will not be so
useful. I suspect it should work on a real machine, as hints suggested
that it was at least considered.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
I've been attempting to (likely incorrectly) get
the DEUNA emulation
working in SIMH's KS10 simulator.
Current status:
* Exists
* Has an address
* Has a vector
* Can be enabled
* Can attach to host interface
...and that's as far as I've gotten. Currently having issues getting
TOPS-10 to successfully link for KS10 with ethernet support. Anyone
have a pre-genned MONITOR executable?
I barely know C...but my patches work:
.r [1,2]arplst
10.10.0.9 is at d0:63:b4:00:6e:53, ttl = 300
10.10.10.2 is at 20:c9:d0:da:8f:67, ttl = 300
10.10.2.3 is at 08:00:27:6b:99:01, ttl = 300
10.10.10.1 is at 68:05:ca:2b:6e:be, ttl = 300
10.10.10.16 is at 00:14:69:e2:75:57, ttl = 300
10.10.1.3 is at 08:00:27:ca:5a:c2, ttl = 300
10.10.2.3) at 08:00:27:6b:99:01 on em0 expires in 1068 seconds [ethernet]
(10.10.1.3) at 08:00:27:ca:5a:c2 on em0 expires in 1179 seconds [ethernet]
(10.10.10.1) at 68:05:ca:2b:6e:be on em0 permanent [ethernet]
(10.10.10.16) at 00:14:69:e2:75:57 on em0 expires in 1063 seconds [ethernet]