SC1041_SAIL_PDP-6_hardware_log_1968-01

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[Notebook page] 47

1245 Jan. 25 1968

When we ran Instruction Test-Part 3, the program repeatedly halted when it was unable to reset the TTY Busy Flag. After tracing logic signals on the 626 TTY Control, we found that the IOB 27 wire on A14-N had a cold solder joint! After re-soldering this joint we ran Inst. Test - Part 3 for 10 minutes without any failures.

Next we ran INST TEST - Part 4 without getting any errors. (Ran for 10 minutes.)

RAN INS TEST PT 5, got errors in the simulation, but none in the real instruction.

Found a loose buss connector in back of CP 1K. Put it on tight couldn't get bug to return. Pt 5 runs with 2D,E,H,J - 15 margins at +2V and -3V. SRR

1800 25 Jan 68

Ran UINS5 in timesharing - got 2 errors in 2 hrs 45 min.

Started running Pt 1 with 6205's on -15V margins. Found that cary into bit 1 from bit 2 was failing, independent of margins on 2E, F, H, J. (note no margins on 2D which probably explains it.) found 6205 for bit 3 was very sensitive to mechanical shock. traded bit 1 and bits 2.

Machine back at 1630

(over)

Last edit over 1 year ago by Khufu
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Traded 6 with 7.

Bit 6 (2DE 11) was microphonic. Traded it with Bit 7 (2DE 12). Machine worked.

Ran margins up and down Banged on boards, etc. bugs didn't return.

Found that wiping core 3 IF 4 & 5 boards hard caused bits 3 & 5 to be dropped when running disk & having CP ok split cycles. Couldn't make it go away. Checked sockets, changed cards, pinched connectors. no trouble found trouble not there. Probably not related to "533 bug". Machine back at 0030 SRR

26 Jan Type 30 goes away randomly when running it. It will come back again when reinitalized. Can't tell if Hardware or software. Pinole

12:00 1/26/67 Dth Drives 6 and 7 now have guides with no anodizing on the surface. After instalation ran DECTAPE Test with a static tape. No Errors. Fred Parot Ted [Pool?]

Last edit over 1 year ago by Khufu
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12:30 1/26/68 ALL IN AMPEX CORE!! Fred Parofsky

[START printout inserted onto logbook page]

CORE PARITY ERROR, LOCATION 000000262653 OPND=000373000168 PC=3400000006274 INSTR=2510420000000 DATE=000641152450 TIME=1235:46

CORE PARITY ERROR, LOCATION 000000262723 OPND=000066000726 PC=3400000006274 INSTR=2510420000000 DATE=000641152450 TIME=1235:06

CORE PARITY ERROR, LOCATION 000000264763 OPND=012173104762 PC=750000163061 INSTR=24604777773 DATE=000641152375 TIME=1156:56

CORE PARITY ERROR, LOCATION 000000264773 OPND=105061104767 PC=750000163061 INSTR=246040777773 DATE=000641152375 TIME=1157:17

CORE PARITY ERROR? ERROR IN JOB 1 ADDRESS CHECK FOR DEVICE DTA3; UUO AT USER 1111 ↑C

[END printout]

Last edit over 1 year ago by Khufu
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Traded 6 with 7. But 6 (2DE11) was microphonic, Traded it with Bit 7 (2 DE 12) Machine worked. Run margins up and down Banded on boards, ets, bugs didn't returned. Found that wiping core. 3 if [4&5?] borads hard caused [arts?] 3 & 4 to be dropped when running disk & having [cp?] ok split cycles, couldn't make it go away. Checked sockets, changed cards, punched connectors, no trouble [founed] trouble not there. Probably not related to " 533 bugs" Machine back lot 0230 SRR 26 Jan. Type 30 goes away randomly when running it will come back again when [---------?] Can't tell if [Hardered?] or softwood [Pingle?] 12:00 1/26/67 D+A Dries 6 and 7 now have [graded?] with no anodizing on the surfice. After instalation ran DECTAPE Test with a static tape No Errors. Fred [Pa------?]

Last edit over 4 years ago by DreJoe
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[printout taped to page]

CORE PARITY ERROR, LOCATION 000000260603 OPND = 003761400037 PC = 340000006274 INSTR = 251042000000 DATE = 000641152436 TIME = 1225:39

CORE PARITY ERROR, LOCATION 000000260773 OPND = 044272444650 PC = 340000006274 INSTR = 251042000000 DATE = 000641152436 TIME = 1225:59

CORE PARITY ERROR, LOCATION 000000264763 OPND = 012173104762 PC = 750000163061 INSTR = 246040777773 DATE = 000641152375 TIME = 1156:56

CORE PARITY ERROR, LOCATION 000000264773 OPND = 105061104767 PC = 750000163061 INSTR = 246040777773 DATE = 000641152375 TIME = 1157:17

CORE PARITY ERROR? ERROR IN JOB 1 ADDRESS CHECK FOR DEVICE DTA3: UUO AT USER 1111

[end of printout]

Last edit over 4 years ago by Soazdrmm
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