Troubleshooting RX02

From: Vintage Computer Festival <>
Date: Fri Feb 4 18:43:30 2005

On Fri, 4 Feb 2005, Ethan Dicks wrote:

> > 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?

Yes, which now makes sense, since the original controller card that was in
the system, the MXV21, has its own boot PROM. I removed the
clock/calendar because the batteries had all leaked and it was a general
mess. I believe that was the mistake in all this.

> 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.

The memory is an M8044-DC (32Kword 16-bit MOS, if that tells you what you
need to know).

Sellam Ismail                                        Vintage Computer Festival
International Man of Intrigue and Danger      
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Received on Fri Feb 04 2005 - 18:43:30 GMT

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