PDP-11/45: Diagnostics XIV - CPU, MMU, FPU Complete!

Okay, after socketing in the replacement 74H10 and reseating a few boards, the output from the floating point diagnostic now looks correct:

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................ ................ ................ 11.............. 11.............. 11.............. .......1111..... ................ ................ ................ ................ .11............. .11............. .11............. ..........11.... ................ ................ ................ ................ ..11............ ..11............ ..11............ ...........11... ................ ................ ................ ................ ...11........... ...11........... ...11........... ............11.. ................ ................ ................ ................ ....11.......... ....11.......... ....11.......... .............11. ................ ................ ................ ................ .....11......... .....11......... .....11......... ..............11 ................ ................ ................ ................ ......11........ ......11........ ......11........ ...............1 1............... ................ ................ 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With this fix, the machine is now reliably passing the complete suite of CPU, MMU, and FPU diagnostics -- 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.

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.

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.