9 Feb
2012
9 Feb
'12
1:29 a.m.
On 02/08/2012 07:50 PM, allison wrote:
I believe the backplane was different.for the uVAX1,
and different
from the 11/23 and uVAXII in the CD slot usage. though the backplane
is swappable.
I'm not aware of any different backplane for the MicroVAX-I. I've
certainly run several MicroVAX-Is in different, formerly PDP-11 Qbus
chassis, like the BA11-SA for example, and several non-MicroVAX-I BA23s,
and my "woodie boxes" (internal DEC prototypes of the BA123 that were
built with mostly BA23 parts including a standard BA23 backplane).
Using a SCSI controller is the way out but watch for
dives over 1GB for
the boot drive.
I forget if that affected only the older 3100s or also the uVAX-II boot
as well.
It's not an issue on the MicroVAX-II because it'll only end up
speaking MSCP to the controller, and never knows there's SCSI on the
other end. It's an issue for early integrated desktop VAXstations
because the boot ROM only uses so many bits (I forget how many just now)
to address a logical block.
-Dave
--
Dave McGuire
New Kensington, PA