MAINDEX-11 CZKMA Diagnostic?

Ben Sinclair ben at
Wed Aug 19 14:13:24 CDT 2015

Thanks everyone! It's running right now, and seems to be passing,
however the parity error LED on the board is lit.

The docs mentioned that ZKMA's messages (plus the source) would lead
me to a potential bad module, but it doesn't seem to be failing.

VMJAB0 doesn't run at all on my system. It turns off the run light as
soon as it starts.That's why I was wanting to try the diagnostic
mentioned in the MSV-11 manual.

On Wed, Aug 19, 2015 at 7:25 AM, Johnny Billquist <bqt at> wrote:
> On 2015-08-19 04:36, Ben Sinclair wrote:
>> I'm again trying to debug my PDP-11/23, and I believe I'm having
>> trouble with my M8067-LB/MSV-11 memory.
>> According to the manual, there is a diagnostic program called CZKMA
>> (for my 18-bit system), but I can't seem to find it.
>> I have all of the xxdp images from AK6DN, but this one doesn't appear
>> to be on any of those. Some searching shows references to it and even
>> a (poorly) scanned source listing, but does anyone know if I can get
>> it on a TU58 image or another format?
> Others have already given pointers and help. I thought I should point out
> that when a diagnostic is called CZKMA, the actual filename in XXDP will not
> have the leading 'C', and in addition it will have two characters appended,
> which gives a version.
> So, the normal way to refer to the diagnostic CZKMA as a file in XXDP would
> be ZKMA??
>         Johnny

Ben Sinclair
ben at

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