8 Aug
2010
8 Aug
'10
5:20 p.m.
Pontus Pihlgren <pontus at Update.UU.SE> wrote:
Hi
I've acquired two PDP-11/44 and have just now gone throught the list of
cards in the cpu-boxes and the spares. Here is a list:
http://www.update.uu.se/~pontus/slask/11-44-kort.txt
Nice! You'll be able to put together atleast one really nice 11/44 from
that. I notice one FP11 in the list.
Also I wonder what the
"M7251 KG11-A U Network interface XOR and CRC block check option"
Just what it says, Network interface XOR and CRC block check option. :-)
Ok. The long answer then... You know about CRC-16 I assume?
This is hardware to generate that. You shove data to the card, one word
at a time, and you can read out the CRC value.
This card is, however, not very popular or useful, since software CRC
routines are actually faster on the PDP-11. DECnet can use this card if
you have it, but it's recommended that it not be used for this fact.
(The card is actually more generic, and can be used to generate any kind
of CRC checksum, not just CRC-16.)
"M3110 DRCSA U Protocol assist #1
w/special character check and CRC (DEC/DLC/DRCSA)"
"M3111 DRCSA U Protocol assist #2 w/special character check and CRC
(DEC/DLC/DRCSA)"
No clear idea about those two...
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