Restoring a MicroPDP-11/73
I have a number of MicroPDP-11 systems which needs
restoring, among them a nice 11/73 in pedistal
enclosure. This is the restoration log.
Last updated: 2014-AUG-21 <- Click for the latest!
Inventory Day! 2014-AUG-20
The first order of the day is to take an inventory of the
machine. The backplane contains:
| M8190-AB | |
| M8067-LB | |
| M8067-LH | |
| M7605 | |
| M9047 | M3106 |
| M3104 | |
| M7555 | |
According to the excellent Field Guide to Qbus and Unibus Modules this is:
M8190-AB KDJ11-BB Q J11 CPU 15MHz with 2 boot & diagnostic ROMs M8190-AB FPJ11 compatibility (warm floating point, but M8190-AB will accept FPA) M8190-ABRefs: EK-KDJ1B-UG, uNOTE N#039
M8067-LA MSV11-PL Q 512-Kbyte MOS memory with parity CSR M8067-LA (Also M8067-LC, -LF, -LH, -LJ, -LP, -LV) M8067-LARefs: EK-MSV0P-UG, MP-01239, ZJ246-RZ
M7605 TQK25 Q 0.25" streaming tape drive controller (TK25) M7605Refs: uNOTE N#041
M9047 Q Grant continuity (also M9047-SA, -SF)
M3106 DZQ11-M Q 4-line double-buffered async MUX, EIA 50-10KB, M3106 with modem control; replaces M7957 (dual height) M3106Refs: EK-DZQ11-UG, EK-DZQ11-MC, EK-DZQ11-TM, MP-01795 M3106Refs: ZJ251-RZ
M3104 DHV11-A Q 8-line Asynchronous Multiplexor, with DMA M3104Refs: EK-DHV11-TM, EK-DHV11-MC, MP-01783, ZJ362-RZ M3104Refs: uNOTE N#041
M7555 RQDX3 Q MFM Winchester and floppy disk controller M7555 (RX50/RX33/RD50-54/RD31/RD32/RD33) M7555Refs: EK-RQDX3-UG, uNOTEs N#041, N#043
Broken power 2014-AUG-21
The front panel power switch was stuck to ON. I unscrewed the
front panel and removed the power switch, taking care to
document how the cables were connected. Prying appart the the
switch revealed three broken plastic teeth that guides the
springs. Unable to glue the plastics back together I figured
out that these switches are manufactured by Dreefs and called
"T100 2WiXII". I have ordered from $AUCTION_SITE, but they are
available from rfparts.com too.
Here is the switch in pieces:
