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Path: utzoo!linus!security!genrad!decvax!mcvax!haring!jaap
From: jaap@haring.UUCP (Jaap Akkerhuis)
Newsgroups: net.unix-wizards
Subject: Re: Bus speeds. - (nf)
Message-ID: <112@haring.UUCP>
Date: Thu, 15-Dec-83 08:06:05 EST
Article-I.D.: haring.112
Posted: Thu Dec 15 08:06:05 1983
Date-Received: Sat, 17-Dec-83 01:09:14 EST
References: <4439@uiucdcs.UUCP>
Organization: CWI, Amsterdam
Lines: 42

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.