Troubleshooting RX02

From: Ethan Dicks <>
Date: Fri Feb 4 18:32:10 2005

On Fri, 4 Feb 2005 15:46:55 -0800 (PST), Vintage Computer Festival
<> wrote:
> I've got the manuals for both cards, and both have boot PROMs. I think I
> see what the problem might be, which you refer to below...

Handy to have those manuals...
> I now have something like 6 boot floppies, and none are coming up.
> Coupled with my experience with floppies and how hardy they can be, I have
> no reason to believe that all are bad.

Exactly... there is no reason to expect all 6 are bad.
> Yep, I now realize that. I'll look into the M9400 and see how to go about
> disabling the boot code. If not, I'll just put the clock/calendar card
> back in, as I believe that provides termination but has no boot PROMs.

Was that clock/calendar card originally in a box with that CPU/memory
combo? One thing about the 11/03 and its low-density memory is that
the memory cards do not provide their own refresh like the newer cards
did for the 11/23 and up. I mention this so that if you pull the
M9400 and replace it, you might want to check your memory. This would
apply to the cards that use 4kbit DRAMs, not 4116s.

> I verified that at least the first 17 bytes of memory are working by
> poking bytes throughout that range and reading them back (via ODT).

> Anyway, I think I'm close now...


Received on Fri Feb 04 2005 - 18:32:10 GMT

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