SC1041_SAIL_PDP-6_hardware_log_1967-09

149

Line 7 in 630 has questionable reciever [sic] (with tag on it).

L.H.G.

1715 Attached mising +/0V in IJI D.P. Found regulator transistor and control transistor dead. Replaced both. Added two resistors to circuit to protect against future gaps. +/0 now read +11; seems ok.

RAS

1720 5 Jan 68

Found that W102's in Ampex interface are signal eaters when power is off; 167 & 166 work much better (memory buss-wise) with power on in Ampex interface.

D.W.P.

1245 6 Jan 68

D Poole forgot to log that he tried to bring the computer at 0030 and plugged the wrong 6615's [left arrow] SLANDER! into the wrong place. He then gave up in disgust, according to informed sources. Power has been off on the computer since about 1800 yesterday. Librascope interior temp is 90½ °F

150

I have seen it as high as 91° but I failed to record it.

SRR

1700 Jan 6, 68

CP brought up with 6205's.

1830 S. Russell inserts 6615's with his col 73

1950 Found cold solder on internal jumper on 6615 at 2HJ15

2220 Found unsoldered (open) eyelet or 6205 bit 8 Quoting a famed 20th century philosopher: "DOOM!"

The little old ladies strike again.

2230 Bit 35 swapping input appeared to not get swap L → R pulse, but the bug disappeared before our very eyes.

"DOUBLE DOOM"

1415 inst pt 1

151

inst pt 1 - 1331

2300

S. Russell recommends PM which causes "DOOM"

An impartial survey has concluded S. Russell should hang by the balls with cutanable bus wire until a cold solder joint occurs.

SOSE fails in the 3 only in counting down address 4227 (or others in core 3) The number 1 counts to -4

[margin] inst pt. 1 2331

I quit L.H.D.

WE ALL QUIT!!!!

152

0700 7 JAN '68

AFTER 7 HOURS OF CAREFUL PRODDING, PDP-6 SEEMS TO BE UP (DESPITE BEST EFFORTS OF SRR AND CREW). FOUND 3 BAD 6205's, FIXED ONE (NOW BIT 35); TROUBLE WAS SOLDERING HACKERY DURING GREAT SOLDER WARMING SIEGE.

ONE MYSTERIOUS BUG DISAPPEARED FOR NO APPARENT REASON: CARRY DROPPING BETWEEN BITS 2 AND 1.

RAN ALL PARTS INS. TEST BRIEFLY; ALSO TIME-SHARED VINS 4, 5, BLTST.

FINALLY, LEST THIS VOLUME OF THE MIGHTY SAGA END ON A NOTE OF UNDUE OPTIMISM, LET NONE FORGET THIS WORD: THOUGH THIS BE AN HOUR OF TRIUMPH, THE FORCE OF EVIL ARE NOT VANQUISHED, AND UNDER EACH BEDSHEET BOARD, BEHIND EVERY BUSS CONNECTOR, AND IN ALL DARK PLACES OF THE WORLD, WAITING EVER TO TRAP THE UNWARY LOSER, THERE LURKS OMNIPRESENT, IMPLACABLE DOOM!! DMP

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