Path: utzoo!attcan!uunet!jarthur!usc!ucsd!ucbvax!bloom-beacon!eru!luth!sunic!mcsun!hp4nl!vax1.sara.nl!scheun
From: scheun@vax1.sara.nl
Newsgroups: comp.sys.dec
Subject: DMAC support for Unibus in VAX 6000 series?
Message-ID: <1990Jul18.165010.2382@vax1.sara.nl>
Date: 18 Jul 90 15:50:07 GMT
Organization: SARA, Academic Computing Services Amsterdam (NL)
Lines: 20

I don't know exactly if this is the right newsgroup to direct my question. We
have apoor, old, overloaded VAX 11/785 which we would like to replace by a
shining new VAX from the 6000 series. There is however one problem. We have a
connection to LCN (Loosely Coupled Network, a CDC network) through a DMAC
interface. CDC does noet have a BI interface to replace the DMAC. A solution
would be to attach a Unibus to the BI bus and use this for the DMAC. Now I
have heard rumours that CDC does not support this configuration. Up till now I
have not been able to get a denial nor confirmation from our local CDC contact.

I have two questions:

1	What are the experiences with a Unibus connected to a BI bus in a VAX
	6000 series computer?

2	Does anyone know of a situation where a DMAC interface is used as
	described above?

Willem van der Scheun
SARA (Academic Computing Services Amsterdam)
Amsterdam