QBus termination?

[Vintage Computer Festival]

On Wed, 9 Feb 2005, Pete Turnbull wrote:

> > At any rate, this would indicate that this thing has its boot PROMs
> > enabled, which confuses me, since this system came loaded with both
> this
> > card and the DSD-440 controller (which has its own boot PROMs).
>
> Maybe the DSD-440 bootstrap is disabled. Or mybe they almost manage to
> co-exist.

Ok, I can see clearly now.  The bootstrap on the DSD controller is
disabled.  This makes sense as it originally came out of the generic LSI
11/23 system that has the M9400-YA.  I remember determining that before
but completely forgot about it during all my swapping.  Now that the card
is back in the original system it's working fine.

> > I booted the system again and got the $ prompt. I tried some of the
> > commands the REV11 page above mentions. OD enters ODT (but breaks at
> > 165246). XM (supposedly performs memory test) works; short pause
> before
> > returning to $ prompt. XC (supposed processor diagnostic) returns
> > immediately (which is supposed to be good).
> >
> > However, RK (RK05 boot), AL and AR commands are not recognized. This
> is
> > with the MXV11 controller and with the DSD-440 controller.
>
> The RK might not appear to be recognised if it looks to see whether
> there's a device at the RKV11 address.  I'm surprised AL/AR don't do
> something.

The RK05 controller is installed, but no drive is attached.  Would this
prevent that command from working?

I'm also surprised the AL/AR commands don't work.  I get back AL? or AR?
when I try to issue them.

-- 

Sellam Ismail                                        Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger                http://www.vintage.org

[ Old computing resources for business || Buy/Sell/Trade Vintage Computers   ]
[ and academia at www.VintageTech.com  || at http://marketplace.vintage.org  ]