Q-BUS primer?

Pete Turnbull pete at dunnington.plus.com
Mon Feb 4 19:22:00 CST 2008

On 04/02/2008 21:23, tiggerlasv at aim.com wrote:
> On 04-Feb-08, Jerome H. Fine wrote:
>> Probably your best option is to use the BA23 box.  However, for that
>> option, you really need a quad M8189 CPU (PDP-11/23)
>> or a quad M8190 CPU (PDP-11/73).
>> It is entirely possible to use the dual M8186 CPU (PDP-11/23), however,
>> you will then require a controller with a boot ROM (usually only 
> available
>> with a  3rd party disk controller) or you will need to enter the
>> boot program via ODT each time you power on the system.

Or use the RX01 controller and drives (assuming they're present) and run 
RT-11, booting off the MXV11.

> If you look carefully down the list, he's got an M8047 - MXV11 with 
> (P)roms,
> so he'll be able to use the 11/23 that he already has, and, depending on 
> the
> roms installed, should be able to perform an MSCP boot.

M8047 is an MXV11-A, and there's no standard MSCP boot available for 
that.  The MXV11-A will only boot RX01, RX02, RL01, RL02, TU58.  You 
can't even write bootstrap code for it in the way you can for a BDV11 or 
MXV11-B, or a microPDP-11/23plus because the ROMs aren't window-mapped 
and you can only get at 256 bytes.  You can choose which 256-byte page 
by wire-wrapping, but not in software.

Pete						Peter Turnbull
						Network Manager
						University of York

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