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<title>fritzm.github.io - PDP-11/45: KM11 replica and CPU debug III</title>
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<h1>PDP-11/45: KM11 replica and CPU debug III</h1>
Sat 11 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>Received the boards and components for the KM11 replica; stuffed and soldered, and it appears to work! There
are some photos below. I can easily single-step microcode, clock states, and bus cycles now, which should
really help with the CPU debug.</p>
<p>Swapped DAP for a spare, and this has fixed the stuck PC issue. Memory issues remain, but by choosing a
working memory range, I can start to toggle in and attempt to execute very simple programs.</p>
<p>The simplest possible program, unconditional branch to self, seems to execute correctly:</p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1</pre></div></td><td class="code"><div class="highlight"><pre><span></span>001000 000777 BR .-0
</pre></div>
</td></tr></table>
<p>A register to register data move test does not however:</p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
2</pre></div></td><td class="code"><div class="highlight"><pre><span></span>001000 010203 MOV R2,R3
001002 000776 BR .-2
</pre></div>
</td></tr></table>
<p>Control flow is as expected, but the value that ends up in R3 seems to be negated. Still, pretty good
progress! Now that I can step machine states, the next step will be to put the DAP out on an extender card and
start tracking down signals with a logic probe.</p>
<p>The HP1662A logic analyzer from eBay has also arrived; should come in handy in investigating the memory issue.</p>
<p><img src='/images/pdp11/km11_thumbnail_tall.jpg' title='Tom Uban KM11 replica, stuffed with parts and ready to go' onclick='pswipe("pdp11",29);'/>
<img src='/images/pdp11/km11-action_thumbnail_tall.jpg' title='Tom Uban KM11 replica in action' onclick='pswipe("pdp11",30);'/></p></div>
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