QBus termination?

[Pete Turnbull]

On Feb 8 2005, 20:48, Vintage Computer Festival wrote:
> On Tue, 8 Feb 2005, Pete Turnbull wrote:

> > You want to make sure W4 is removed.
>
> Hmmm.  Can't tell exactly what's going on here but my board contains
no
> jumpers, just resistors.  The resistor (or whatever was there) across
W2
> has been cut off.  W4 has a brown thing that looks like a resistor
but
> with one black stripe around the body.  Is that a straight-through
> strapping type device?
>
> 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.

> 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.


-- 
Pete						Peter Turnbull
						Network Manager
						University of York