SC1041_SAIL_PDP-6_hardware_log_1968-01

24-Feb-68 0100

After some suspicious system messages about disk errors, the disk turned on the "WRITE ERROR" red light.

BAND = 345₈ TRK = 0 SAR = 202₈ Took disk off-line. That sector has a parity error on read. Tried WRITE (offline). Got WRITE ERROR. Both all ZEROS and all ONES in the data register gives WRITE ERROR. seems to be independent of sector on that Band + TRK. The error happened about 8 hours late; The traditional time for this kind of thing is 5 PM Friday afternoon. J. Sauter S. Russell

Feb 24, 1968 0900

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[photo] Actual Log Entry

Ring connection intermittent on TTY scanner cord

BP.

1600 24 Feb 68

"DISK Bug" is not a bug, its a feature! Bands above 144₁₀ or 220₈ don't exist selecting then gives WRITE ERROR SRR & J. Sauter should have [?] letter. SRR

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Feb. 25, 1968 1330

When Rod Shmit came in this morning he found the system dead. He tried to reload the system but could only get a "bell" after typing 6L on the CTY. (The system 6 tape did not move.) He noted that the red clip lead that is normally connected between bay 1+2 of the 166 was on the floor. I tried re-loading the system with Hand Waver and was successful. We don't know why the system died or why it would re-load for him. J. Gleason

2/26/68

LPT Ribbon skewed to the right. misses leftmost characters. Probably needs a New ribbon. T. Panofsky

LPT Ribbon changed. T. Panofsky

[page 120]

0245 26-FEB-68 Complaint about system deaths (NXM). No obvious correlation with anything anyone was doing. Investigation of one case showed that the push-down points in the system was junked eye. Ran bare instruction test part 5. No trouble. Rana past 4. No trouble. Had difficulty loading TS MAIN (apparent DECTAPE erase). Also could not load Parts 4 or 5 or system. They had loaded with no trouble a few minutes earlier. Finally (by re-trying) got system loaded. Then loaded TSMAIN. Activited all Parts. No trouble.

J. Sauter