QBus termination?

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Wed Feb 9 02:23:39 2005

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
> jumpers, just resistors. The resistor (or whatever was there) across
> has been cut off. W4 has a brown thing that looks like a resistor
> 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
> 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

> 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
> 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
> 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

Pete						Peter Turnbull
						Network Manager
						University of York
Received on Wed Feb 09 2005 - 02:23:39 GMT

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