[rescue] upgrading VAXstation memory
jp at celestrion.net
Tue Apr 20 22:46:48 CDT 2010
On Tue, 20 Apr 2010, Patrick Giagnocavo wrote:
> I have a 4Mbyte VAXBI board numbered T1019, but I think that must be for
> earlier VAXen.
Not just earlier, but VAXBI is an actual VAX system/peripheral bus,
whereas the RAM slots in a VAXstation 4000 are on a special-purpose
processor-to-memory bus like you'd see in a typical workstation or PC.
VAXBI is a neat bus. Beyond being self-configuring (ie: plug-and-play)
and possibly being a peer with the CPUs, the ZIF connector (what a neat
idea!) carried both the connections to the rest of the bus and connections
to the I/O bulkhead. While this gave the card itself a very clean layout,
also also meant you had bulkhead kits to keep track of along with your I/O
cards: one without the other was useless.
XMI did the same thing, only faster. It's a shame that installing cards
in PCs and Macs still involve screws and dangling cables and lots of other
Jonathan Patschke ) "Oh, judge, your damn laws: the good people don't
Elgin, TX ( need them, and the bad people don't follow them,
USA ) so what good are they?" --Ammon Hennacy
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