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<title>fritzm.github.io - PDP-11/45: MS11-L and CPU debug IV</title>
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<h1>PDP-11/45: MS11-L and CPU debug IV</h1>
Sun 12 June 2016
by <a class="url fn" href="https://fritzm.github.io/author/fritz-mueller.html">Fritz Mueller</a>
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<div><p>Made some progress on the inverted result after register-to-register move problem: with the help of the KM11, extender
card, and a logic probe I was able to track down that signal ALUM L coming onto the DAP is not asserted when it should
be for a MOV instruction. This means the ALU is performing in arithmetic instead of logic mode and thus the incorrect
result.</p>
<p>I next moved the extender card over to GRA, where this signal originates from a subsidiary ROM, but unfortunately at
that point the MS11-L memory behavior got even worse, putting and end to these experiments. So I'll have to tackle
that first...</p>
<p>Moved the M792 ROM over to the expansion backplane where the MS11-L resides, and it works fine there. So it doesn't
seem to be a bus wiring or jumper problem onto the expansion backplane. Checked the power input pins on the backplane
behind the MS11-L. 5V was a little low there; trimmed this up. Probably need to clean or replace the Molex contacts
on the power distribution board in the cabinet, as it seems a few mV are being shed there needlessly compared to the
output of the same regulator on the main backplane, but things seem within stated tolerances for now.</p>
<p>The -15V input to the MS11-L was missing entirely. Removed the DD11 expansion backplane, and added jumpers between
the battery backup supply inputs and the corresponding main supply inputs, per documentation. Now have -15 to the
MS11-L, but still no joy.</p>
<p>Will need to go deeper into the MS11-L next time...</p></div>
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