Thanks Johnny,
You know a lot more than I, and as in this case your reply is very
informative. So what do I do next.

I'm at best a software weenie, how do I diagnose a bus grant problem?
I did the only thing I know to do, reseat boards. No change.
Should I pull some of the controllers that require bus grants?
Are there some XXDP's I should run. Both systems have an RL02 controller,
one has an RX02 controller. Its disk IO that's likely to be the bus grant
isn't it? Thanks, Will

At 12:02 AM 11/13/2005 +0100, you wrote:

>Sounds like an interrupt problem.
>XXDP don't use the interrupt system, so that will work.
>Check bus grants.
> Johnny
>Will Kranz wrote:
>>While I am slowly getting somewhere.
>>Dad had 3 full systems which haven't been booted in over 5 years.
>>Looking closely at some of the terminals I find the note that it
>>was know to be good in Nov 1992. All three were working with RL02
>>boot disks at one point in their lives. All three seem to have at
>>least partially functional CPUs.
>>One system boots and runs RT11 from both RX02 and RL02.
>>Two others, an 11/23 and 11/73, will boot XXDP from my TU58
>>emulator which is promising. However they will not boot RT11 V4.0
>>which I've previously used as my baseline. Its odd, very early
>>on in the boot process (possibly after loading the boot block, but
>>I'll verify this) for RT11 the 'Run' light on the front pannel goes out.
>>However it does NOT fall into ODT, ie I don't get an @ prompt and
>>address on the console. It does not respond to ^C etc, just hung.
>>I can to a restart and repeat this, or boot into XXDP from the other
>>tape image. This is new behavior to me, and I'm open to suggestions.
>>Meanwhile I will reseat some boards, and do some poking around
>>with XXDP and ODT to verify things.

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