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<title>fritzm.github.io - PDP-11/45: Diagnostics XIV - CPU, MMU, FPU Complete!</title>
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<h1>PDP-11/45: Diagnostics XIV - CPU, MMU, FPU Complete!</h1>
Mon 16 January 2017
by <a class="url fn" href="https://fritzm.github.io/author/fritz-mueller.html">Fritz Mueller</a>
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<div><p>Okay, after socketing in the replacement 74H10 and reseating a few boards, the output from the floating
point diagnostic now looks correct:</p>
<p><span style="font-size: x-small; font-family: monospace; white-space: pre; display: block; line-height: normal; font-weight: bold;">................ ................ ................ ................ .........11..... .........11..... .........11..... .........11.....
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................ ................ ................ ................ ..............11 ..............11 ..............11 ..............11
................ ................ ................ ................ ...............1 1..............1 1..............1 1..............1
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................ ......11........ ................ ................ ................ ..............11 ..............11 ..............11
................ .......11....... ................ ................ ................ ...............1 1..............1 1..............1
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...............1 1..............1 1............... ................ ................ ................ .......11....... .......11.......
................ 11.............. 11.............. ................ ................ ................ ........11...... ........11......
................ .11............. .11............. ................ ................ ................ .........11..... .........11.....
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................ .....11......... .....11......... ................ ................ ................ .............11. .............11.
................ ......11........ ......11........ ................ ................ ................ ..............11 ..............11
................ .......11....... .......11....... ................ ................ ................ ...............1 1..............1
.......111...... ........11...... ........11...... ................ ................ ................ ................ 11..............
.......1111..... .........11..... .........11..... ................ ................ ................ ................ .11.............
..........11.... ..........11.... ..........11.... ................ ................ ................ ................ ..11............
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...............1 1..............1 1..............1 1............... ................ ................ ................ .......11.......
................ 11.............. 11.............. 11.............. ................ ................ ................ ........11......
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................ .....11......... .....11......... .....11......... ................ ................ ................ .............11.
................ ......11........ ......11........ ......11........ ................ ................ ................ ..............11
................ .......11....... .......11....... .......11....... ................ ................ ................ ...............1
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.......1111..... .........11..... .........11..... .........11..... ................ ................ ................ ................
.........11..... .........11..... .........11..... .........11..... ................ ................ ................ ................</span></p>
<p>With this fix, <strong>the machine is now reliably passing the complete suite of CPU, MMU, and FPU diagnostics</strong>
-- a real milestone! I also loaded paper tape BASIC via PDP11GUI, swapped the console over to my VT100, and
played around for a little bit. Working well, and gratifying to see the machine actually running some
software other than diagnostics.</p>
<p>So, now, on to the RK11/RK05 storage subsystem for real. I retrieved the rest of the cabinetry,
cleaned and reassembled it, and inspected and cleaned the cabinet-top 860 power controller in the second
cabinet. This had the usual dead neon indicator and a blown fuse, but was otherwise in good shape. At first
I was puzzled by the relay in the 860 not engaging, but after looking at the schematic is was clear that a
jumper plug on J4 connecting pins 1 and 2 was required. I recalled seeing one such banging around loose
in my spare parts box -- so that's where that came from! Cleaned up the cabinet-top fan in the second
cabinet as well.</p>
<p>I have been running the machine off a GFCI quad box behind my washer/dryer, but at this point there is enough
leakage through filter caps in the various power supplies that the GFCI has started to trip from time to time.
Took a pause to rewire the box -- left two of the outlets GFCI protected for the washer/dryer, and rewired two
as non-protected for use with the PDP-11.</p>
<p><img src='/images/pdp11/cabinets_thumbnail_tall.jpg' title='Cabinet side panels and decorative top panels cleaned and installed' onclick='pswipe("pdp11",40);'/>
<img src='/images/pdp11/basic_thumbnail_tall.jpg' title='Running papertape BASIC, loaded via PDP11GUI' onclick='pswipe("pdp11",41);'/></p></div>
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