alt%aids-unix@sri-unix.UUCP (11/30/83)
From: Howard Alt <alt@aids-unix> Does anyone knoe the maximum throughput rates of any of the following busses? (and perhaps special details about how they work, that affect perforamnce) Multibus Unibus Massbus Versabus VMEbus STDbus Qbus PS I'll post details to the net if there is enough interest. Howard.
jab@uokvax.UUCP (12/11/83)
#R:sri-arpa:-1416900:uokvax:6200005:000:591 uokvax!jab Dec 8 01:35:00 1983 From: Howard Alt <alt@aids-unix> Does anyone knoe the maximum throughput rates of any of the following busses? (and perhaps special details about how they work, that affect perforamnce) Multibus Unibus Massbus Versabus VMEbus STDbus Qbus For the DEC UNIBUS, MASSBUS, and Q-bus, look in the "DEC Unibus Handbook" (I believe that's what it's called --- the "DEC Blue Bus Book") for the info on how the bus traffic works, and what bus performce is. (I'm at home, and can't get to mine, sorry.) The book is worth its weight in, umm, err, ahh... gold! Jeff Bowles Lisle, IL
jaap@haring.UUCP (Jaap Akkerhuis) (12/15/83)
The maximum speed for the Unibus ever quoted is 2.5 Mbyte/sec. The maximum speed for the Q-bus ever quoted is 4 Mbyte/sec, (using the new block block mode DMA). More practical speeds are: Unibus 1.7 Mbyte/sec Q-bus 1.2 Mbyte/sec Maximum speeds other buses: Name speed Mbyte/sec comments Multibus 10 (not Multibus II, iBLX option 19 Mbyte/sec) VME-bus 20 (the new VMX option 48 Mbytes) VERSA-bus 20 STD-bus ca. 2.5 S-100 ca. 4 In the European UNIX* systems User Group Unix micros Catalog you will find an overview ca. 100 brands of hardware, which all are supposed to run a flavour of Unix and an article discussing bus-speeds, how to interpret the figures and a short overview of the capabilities of the various buses. The booklet can be ordered from: The Secretary EUUG Owles Hall Buntingford, Herts SG9 9PL United Kingdom The bus handbook from DEC doesn't specify the speed for UNIBUS, LSI-11 or Massbus. Note also that the LSI-11 bus description is not complete. It's weight in gold, ah well, must think about that one. Jaap Akkerhuis ---------------- * Trademark etc. (from who after the 1st of January?) UNIBUS, MASSBUS LSI-11, DEC are trdemarks of Digital Equipment Corporation. Multibus, iLBX are trademarks of Intel Corporation. VERSAbus is a trdemark of Motorola Incorporated.
jdb@mordor.UUCP (12/16/83)
There's a nice description of the UNIBUS in the back of the 1976 PDP-11 Peripherals Handbook. I can't speak from practical experience (my work is principally software) but I found it to be extremely useful in understanding how the UNIBUS and its devices work. By the way, the 1976 Peripherals Handbook is a real gem in other ways too. (Be *sure* to get the year right. Even though it is slipping out of date, 1976 was the last year that this handbook was really decent. The editions from the immediately following years are virtually useless.) -- John Bruner (S-1 Project, Lawrence Livermore National Laboratory) MILNET: jdb@s1-c UUCP: ...!decvax!decwrl!mordor!jdb