[Simh] XXDP v2

[Bob Supnik]

It's the MMU.

After adding the BEVENT disable logic, I noticed that the MMU option 
cannot be disabled in any model, although it was in fact optional in the 
KDF11A module (but not the 11/23 system). So I hacked the configuration 
table to make the MMU optional and tried an 11/23 with no MMU. It hangs 
just like the 11/03, 04, 05, and 20.

Why it fails is unknown. Mattis' real 11/04 gets further than the 
simulator, although it ultimately fails.

/Bob

On 12/30/2015 12:00 PM, simh-request at trailing-edge.com wrote:
> Message: 1
> Date: Wed, 30 Dec 2015 11:28:35 -0500
> From: Bob Supnik <bob at supnik.org>
> To: "simh at trailing-edge.com" <simh at trailing-edge.com>
> Subject: Re: [Simh] XXDP v2
> Message-ID: <56840633.5080505 at supnik.org>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I did a quick hack and removed the clock from the device list,
> effectively disabling it. With that done, the 11/23 runs XXDP V2
> correctly, with 64KB of memory. I'll add BEVENT DISABLE to formalize this.
>
> So the failing systems are the 03, 04, 05, and 20. Possible common factors:
>
> - no memory management
> - no EIS
>
> I tried an 11/03 with EIS and no clock, and it fails, so EIS does not
> appear to be the problem.
>
> I'm now looking for XXDP monitor sources. The failure happens before
> anything is printed, but a listing would still be of great help.
>
> /Bob
>
>
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