Subject: Re: DECsystem 5500 (was Re: system 5900)
To: Dave McGuire <>
From: Warner Losh <>
List: port-pmax
Date: 08/13/1999 13:23:41
In message <> Dave McGuire writes:
: On Fri, 13 Aug 1999, Warner Losh wrote:
: >In message <> Simon Burge writes:
: >: The "??? board" has a bunch of resistors and not much else on
: >: it - I'd guess it's a discrete (!) SCSI or DSSI terminator.
: >
: >It may be a bus grant card.  With Qbus you had to follow stricter
: >rules about card placement than you do with ISA buses, for example.
:   It wouldn't be a grant card if it had resistors on may be a bus
: terminator of some sort, but qbus doesn't really require termination as I
: recall.

No.  I don't think that it did.  i do know that the MicroVAX II I
managed back in the late 1980s had several doublewide cards, but the
terminal card was single wide.  Nothing worked until DEC Field Circus
came out with a bus grant card (I believe that was the name) to fill
in the other half of the double wide slot.  Then everything started
working again.  I guess it was good the school had two DECsystem 20's
so it rated its own Field Service person who came out on site often
enough he just dropped the card by one day and kept it off the books
(since we were part of the school, but a different part, the
accounting for these things got funny).

At eleast that's how my caffeine induced memory is feeding it back to
me now....  I'm sure that port-vax would know for sure :-)