Toggling in PDP-11 Bootstraps...

From: healyzh_at_aracnet.com <(healyzh_at_aracnet.com)>
Date: Tue Mar 21 14:48:38 2000

> might save me a little time/frustration? I'm playing around with some
> parts to try to learn more about how the system works, and here's what
> I've got:
>
> 22bit qbus backplane
> 11/73 cpu
> 1 meg ram
> various device interface cards (Dilog SQ706A, RQDX3, Emulex TC03, RXV21
> clone)
>
> I'd like to be able to set up the simplest system possible and try to
> toggle in a bootstrap. I've played with the ones on metalab (RX01, MSCP)

It sounds like you've got about as messed up a setup there as I've got. I'm
guessing you have the dual height, and not the quad height /73 CPU board.

You mention problems with booting a SCSI disk off the Dilog controller.
Have you verified tha the you don't have boards sitting at the same CSR?
For that matter why do you have the RQDX3 in the system (in my case I use it
for the RX50's).

Do you have any 3rd party disk controllers with a bootstrap built in?
That's how I boot my system.

Just to give you an idea of how messed up my system is, I've got a Viking
SCSI, WQESD/04, and a RQDX3. The Viking has my disks and tape, the RQDX3
the floppy, and alll the WQESD/04 is currently doing is booting the system!
In fact by default the WQESD boots DU0: on the Viking board.

A good goal for you would be to get everything working under RT-11. That's
a great way to learn.

BTW, if you don't have a bootable 3rd party controller, or the DEC board
with the boot ROMs, I hope you've figured out how to send the bootstrap
over a serial line from a PC (I never did).

                        Zane
Received on Tue Mar 21 2000 - 14:48:38 GMT