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From: cetron%utah-ced@UTAH-CS.ARPA.UUCP
Newsgroups: mod.computers.vax
Subject: Re:  TCP RESPONSES, COMPRESS, AND DLVJ1'S
Message-ID: <8702101636.AA03583@utah-ced.ARPA>
Date: Tue, 10-Feb-87 11:36:59 EST
Article-I.D.: utah-ced.8702101636.AA03583
Posted: Tue Feb 10 11:36:59 1987
Date-Received: Wed, 11-Feb-87 20:24:23 EST
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DLVJ1's.....what I remember from a quick (disgusting) look at one:

1. They are not silo'd or DMA capable so you should have them up at
the front of the backplane...

2. Some functions are software selectable, others are put in by hard
jumpers.... it depends on the operating system (some have support for
the software selectable features, others do not).

3. According to my Microvax hardware manual, microvms does NOT support
the DLVJ1 yet.....in 1985.... and my newer 1986 manual doesn't even 
mention it.....

4. DLVJ1's are really 4 dlv11's on one board so you must consider it as
4 seperate devices with four seperate csr's and vectors not just the 
one at 300.

5. Since 1 above and other internal considerations, DL's are NOT ABLE
TO RUN AT OVER 1200 BAUD RELIABLY!!!!!!!. If you do so, you will every
so often lose the rx or tx interrupt enable and that channel will be
useless until totally reset (on vms i think it requires a reboot, on
rsx you can poke the csr through the I/O page from dcl....)

6.  If you really need to know whether microvms supports the dlvj's
let me know direct and I will peruse the 'fiche...

-ed cetron
univ of utah...