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<h1>PDP-11/45: Some parts from eBay</h1>
Sat 09 April 2016
by <a class="url fn" href="https://fritzm.github.io/author/fritz-mueller.html">Fritz Mueller</a>
</div>
<div><p>I've been keeping an eye on eBay and have collected a few more goodies: a DD11-D nine-slot expansion
backplane, a fully populated (128K x 18-bit) MS11-L MOS memory board, and a couple of replacement BC08-R
cables for connecting the console to the CPU cards. The MS11-L is a bit of a luxury; I am figuring it will be
easier to deal with during bring-up than the core memory systems I have on hand. It will also be nice to run
with a full address space.</p>
<p>Below is an updated shot of the CPU chassis with the expansion backplane installed, populated with bus
jumpers, terminators, grant continuity cards, the MS11-L memory, a DL11 serial interface, and an M792-YB
bootstrap ROM. I've gone ahead and slotted in the FPU in the first four slots, since the cleaned and
refurbished CPU cabinet is probably the safest place to store them now. Console cables are also installed:</p>
<p><img src='/images/pdp11/boards-in-chassis-2_thumbnail_tall.jpg' title='Backplane and expansion populated with CPU, MMU, FPU, bootstrap ROM, console serial, 256K RAM, grant continuity cards and terminators' onclick='pswipe("pdp11",19);'/></p>
<p>The M792 ROM is an interesting bit, and probably worth a comment. This is a 32-word diode-matrix ROM card.
The bits are physically laid out on the card (see pictures below); where there is a diode, there is a logical
1 bit and where there is the absence of a diode there is a logical 0 bit. Typically the matrix would be
loaded with a bootstrap program, to save the operator from having to toggle it in from the console on each
boot.</p>
<p>The program could be modified by physically adding or removing diodes in the matrix. My card has had such a
mod; there is a handwritten note attached from some engineer describing this. The mod customizes the
bootstrap to always load from an RK disk unit, to avoid having to toggle in the device address at boot. I
will probably revert this mod because I like having things in fairly stock/usual condition.</p>
<p><img src='/images/pdp11/mr11-with-note_thumbnail_tall.jpg' title='A modified M792-YB bootstrap ROM, with a vintage note attached' onclick='pswipe("pdp11",20);'/>
<img src='/images/pdp11/mr11-bare_thumbnail_tall.jpg' title='M792-YB bootstrap ROM with note removed' onclick='pswipe("pdp11",21);'/></p>
<p>For fun, here's the source listing of the stock bootstrap. You can match the octal digits of the machine code
against the diodes in the ROM above (low word addresses at the top of the matrix, and least-significant-bits
on the left).</p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
2
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24</pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="nt">173100</span> <span class="nt">013701</span> <span class="nt">MOV</span> <span class="o">@</span><span class="p">#</span><span class="nn">177570</span><span class="o">,</span><span class="nt">R1</span> <span class="o">;</span><span class="nt">READ</span> <span class="nt">SWITCH</span> <span class="nt">REG</span> <span class="nt">FOR</span> <span class="o">....</span>
<span class="nt">177570</span>
<span class="nt">173104</span> <span class="nt">000005</span> <span class="nt">BEGIN</span><span class="o">:</span> <span class="nt">RESET</span> <span class="o">;</span><span class="nt">FORCE</span> <span class="nt">CLEAR</span> <span class="nt">IF</span> <span class="nt">RETRY</span>
<span class="nt">173106</span> <span class="nt">010100</span> <span class="nt">MOV</span> <span class="nt">R1</span><span class="o">,</span><span class="nt">R0</span> <span class="o">;...</span><span class="p">.</span><span class="nc">DEVICE</span> <span class="nt">WC</span> <span class="nt">ADDRESS</span>
<span class="nt">173110</span> <span class="nt">012710</span> <span class="nt">MOV</span> <span class="p">#</span><span class="nn">-256</span><span class="o">,</span><span class="p">@</span><span class="k">R0</span> <span class="p">;</span><span class="nt">SET</span> <span class="nt">TO</span> <span class="nt">READ</span> <span class="nt">256</span> <span class="nt">WORDS</span>
<span class="nt">177400</span>
<span class="nt">173114</span> <span class="nt">020027</span> <span class="nt">CMP</span> <span class="nt">R0</span><span class="o">,</span><span class="p">#</span><span class="nn">177344</span> <span class="o">;</span><span class="nt">IS</span> <span class="nt">IT</span> <span class="nt">DECTAPE</span><span class="o">?</span>
<span class="nt">177344</span>
<span class="nt">173120</span> <span class="nt">001007</span> <span class="nt">BNE</span> <span class="nt">START</span> <span class="o">;</span><span class="nt">NO</span><span class="o">.</span> <span class="nt">GO</span> <span class="nt">TO</span> <span class="nt">START</span>
<span class="nt">173122</span> <span class="nt">012740</span> <span class="nt">MOV</span> <span class="p">#</span><span class="nn">4002</span><span class="o">,</span><span class="nt">-</span><span class="o">(</span><span class="nt">R0</span><span class="o">)</span> <span class="o">;</span><span class="nt">YES</span><span class="o">.</span> <span class="nt">MOVE</span> <span class="nt">TAPE</span> <span class="nt">TO</span> <span class="nt">FRONT</span>
<span class="nt">004002</span>
<span class="nt">173126</span> <span class="nt">005710</span> <span class="nt">TST</span> <span class="p">@</span><span class="k">R0</span> <span class="p">;</span><span class="nt">WAIT</span> <span class="nt">FOR</span> <span class="nt">ERROR</span><span class="o">!</span>
<span class="nt">173130</span> <span class="nt">100376</span> <span class="nt">BPL</span> <span class="p">.</span><span class="nc">-2</span>
<span class="nt">173132</span> <span class="nt">005740</span> <span class="nt">TST</span> <span class="nt">-</span><span class="o">(</span><span class="nt">R0</span><span class="o">)</span> <span class="o">;</span><span class="nt">IS</span> <span class="nt">IT</span> <span class="nt">ENDZONE</span><span class="o">?</span>
<span class="nt">173134</span> <span class="nt">100363</span> <span class="nt">BPL</span> <span class="nt">BEGIN</span> <span class="o">;</span><span class="nt">NO</span><span class="o">.</span> <span class="nt">TRY</span> <span class="nt">AGAIN</span>
<span class="nt">173136</span> <span class="nt">022020</span> <span class="nt">CMP</span> <span class="o">(</span><span class="nt">R0</span><span class="o">)+,(</span><span class="nt">R0</span><span class="o">)+</span> <span class="o">;</span><span class="nt">ADJUST</span> <span class="nt">POINTER</span>
<span class="nt">173140</span> <span class="nt">012740</span> <span class="nt">START</span><span class="o">:</span> <span class="nt">MOV</span> <span class="p">#</span><span class="nn">5</span><span class="o">,</span><span class="nt">-</span><span class="o">(</span><span class="nt">R0</span><span class="o">)</span> <span class="o">;</span><span class="nt">NOW</span> <span class="nt">START</span> <span class="nt">ACTUAL</span> <span class="nt">READ</span>
<span class="nt">000005</span>
<span class="nt">173144</span> <span class="nt">105710</span> <span class="nt">TSTB</span> <span class="p">@</span><span class="k">R0</span> <span class="p">;</span><span class="nt">WAIT</span> <span class="nt">FOR</span> <span class="nt">DONE</span>
<span class="nt">173146</span> <span class="nt">100376</span> <span class="nt">BPL</span> <span class="p">.</span><span class="nc">-2</span>
<span class="nt">173150</span> <span class="nt">005710</span> <span class="nt">TST</span> <span class="p">@</span><span class="k">R0</span> <span class="p">;</span><span class="nt">ERROR</span> <span class="nt">ENCOUNTERED</span><span class="o">?</span>
<span class="nt">173152</span> <span class="nt">100754</span> <span class="nt">BMI</span> <span class="nt">BEGIN</span> <span class="o">;</span><span class="nt">IF</span> <span class="nt">SO</span> <span class="nt">START</span> <span class="nt">OVER</span>
<span class="nt">173154</span> <span class="nt">105010</span> <span class="nt">CLRB</span> <span class="p">@</span><span class="k">R0</span> <span class="p">;</span><span class="nt">FOR</span> <span class="nt">DECTAPE</span><span class="o">,</span><span class="nt">STOP</span> <span class="nt">TRANSPORT</span>
<span class="nt">173156</span> <span class="nt">000137</span> <span class="nt">JMP</span> <span class="o">@</span><span class="p">#</span><span class="nn">0</span> <span class="o">;</span><span class="nt">GO</span> <span class="nt">TO</span> <span class="nt">ROUTINE</span> <span class="nt">LOADED</span>
</pre></div>
</td></tr></table>
<p>Hmmm, the Pygments syntax highlighting package used by my blog generator doesn't seem to grok MACRO-11; may
have to do something about that...</p></div>
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