ENPages That Need Review
SC1041_SAIL_PDP-6_hardware_log_1968-01
76
Observation:
1) Errors increase rapidly as size of area read increase.
2) Misses appears to be somewhat corelated with system activity. Total [activity?] was 1 [bip?] program and 2 music programs. [Wast?] misses (last amount read) seemed to occur when someone typed.
3) Parity errors may be same ones we have seen for several days when programs seen in ampex [?] and not a result of using TV. There were no parity errors found by 167.
4) Error rate for size of rectangles read by edge follower appears to be around the limit we can tolerate but we can live with it if necessary. MICROSCAN users may be unhappy when reading large frames. It appeared, although I have no statistics, [like?] the misses were fairly evenly distributed through the read instead of banded together. I could test this if desired.
[Pingle?]
1/30/68 9:30
Readjusted format tape lights for Analex printer to try to stop it from skipping pages. It will not fail for me, but time will tell.
Tod [Pagliz?]
79
0900 1 Feb 68
De-interleaved
Looked at AMPEX mem 1 problems. Found the resetting problem. At one point [I0?] DL light was on. Much resetting and putting scope probes on I0 ADRS ACK and I0 ST SYS cured it.
AMP 1 was dropping bits with NA = 3xxxx5 sometimes bit 17 would not drop. eventually found that [locations?] of the form [?] xxx5 worked.
eventually found that moving module in stack F P6 moved bug subsequently Ohmeter tests by R Sounders show that the input for selects is a [shorf?]. other input is a diode.
Lift card out of stack F & left stack F extended. Magnetics modules give battle scars too. The connectors hurt.
SRR
1430 1 Feb 68
Core 0 not AW RQ. DP may have been running, CP was running.
RESTART, P3 LAST
SRR
1530 1 FEB 68
CORE 0 NOT AW RQ AGAIN. P2 LAST, RD, WR, SYNC, P2 ACT. [W?] R. WALLER LOSES!!
D.M.P
81
Feb. 2, 1968 0900
System died at 0900. Had a NONEX MEM AND A PARITY ERROR. Could NOT RESTART AT 140, but was able to restart at 143.
J. Gleason
Note: A Humidity meter has been installed nest to the air conditioning controls behind the disk. To read it, first subtract the reading of the wet-bulb thermometer from the dry-bult thermometer; Then set the red number on the top of the conversion dial to this temperature diffrence. Read the humidity on the dial across from the dry-bulb thermometer.
The temperature difference this morning is 72° = 60° = 12°. The humidity reading across from 72° is 49%.
J. Gleason
1020
TTY 7 exhibited the "bad guy" bug; i.e. it would respond to ↑C, but not to other characters. When this occurs the system usually has to be restarted at 140. However, it was empirically determined that ↑M restored control this time!
J. Gleason
1200 Scratch Tape 140 seems defective (or DTA 1 is N.[G?])
L. Smith
14:15 DTA1 DID NOT READ TAPE PROPERLY GIVING "BINARY OUTPUT ERROR" IN F[?] COMP. SWITCHED TO DTA3 and problem went away
D. [Prepis?]
88
0015 5 Feb 68
Tried 3.15/05. Found 533 bug [still?] strikes, about as frequently as before. I suspect that the adjustment of R/W current had no effect, but I can't be sure.
SRR
3.15/05 with 2 copies of 40K BLT ST runs with core 3 IF & 1H + 10 A & B margins from [10?] V low to 1 V low. fails occasionaly at zero. Leave the margins supply at 5 V
SRR
1000 - 5 Feb 68
We, Leland Smith & I, spent 15 minutes [?] trying to see what is wrong with audio-output only to find that the hardware log says 'it is down'. Would it be possible to have a prominent display of the things that are not working so that every one can know the state of the system with looking through lot of hardware log failures
Raj Reddy
91
Feb. 6, 1968
We apparently have two bad balun boards. One (dated 2/5/68) says "SECT 4 Loses." The other (dated 2/6/68) says "SECTION 13 loses." I checked all of the diodes, balun transofmers, and termination resistors on both boards. The board labeled "SECTION 4 LOSES" had an open eyelet on pin 1 (which connects to Sect. 4). This has been resold and tested with a meter. It still must be tested on the machine. I couldn't find anything wrong with the board labeled "SECTION 13 loses"; but I noticed that its contacts have not been erased. We'll have to find out what "SECTION 13 loses" means before we can look further for the trouble.
J. Gleason
1630 6 FEB 68
ALL DATAPHONES & TWX interaces don't work on REMOTE → COMPUTE TWX [originals?] get to output of 4504 but not into the 630 line scanner Local TTY's still work.
?
SRR
1700 6 Feb 68
Replaced [Y?] sink driver in AMP 1 Mag Module G JG. It had not been touched since Sat night. The final version of the bug was that no locations in MAG MOD G didn't [shook?] Deposit of all 1's gave back almost all zero's. Current [?]forms looked fine.
SRR
92
0130 7 Feb 68
TROUBLE WITH 630 not talking to data sets was a subtly intermittent patch cord. When patching in a data set like so: [diagram] it was open on the [sleve?] lead. When patched to the local teletypes - like so: [diagram] it was conducting.
SRR
0910
I tried to start a job over the 1799 TWX line and was unable to do anything except "handshake" with the 1799 Dataphone. I was able to TAIK to the TWX TTY, but the 630 did not receive characters from it.
J Gleason
930 7 Feb 68
The TYPE 30 turns itsself off (the display not power) itermitantly. There have been many entries made about it for over a week. It needs to be fixed as soon as possible
Pingle
93
1045 Feb. 7, 1968
Turned off machine for ~2 min to switch off Ampex CORE 0 so that Phil McKay could work on it. Restarted at 143.
Note: This morning we have had 4 Core Parity Errors - all of which were in the Ampex Core. Locations 375735, 202073, 221565, & 340657.
J. Gleason
2:00 7 Feb 68
Fixed bias supply to A-D speech input.
Phil McKay of Ampex installed [?] pair on AMPEX #1.
SRR
0033 8 Feb 68
While chasing disk bugs we found that running chess in a certain region of AMpex core seemed to drop bit 35 and get parity errors.
To get we did following
R FAILSAFE R CHESS * PS
got parity errors all with data = 777777777776 at PMA = 63506, 63514, 63502, 63572 63636, 63630, 63506, 63556, 63504, 63506 63514, 63572, 12766, 63506, 63514, 63572 63572, 63622. (FULL INTERLEAVE]
Replaced B28 + B3, B205, R181 for low order 2 [bits?] of MA for 167 fixed reread problems with 167 in AMpex
54
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------?]
56
Traded 6 with 7
Bit 6 (2 De 11 was microphonic, Traded it with Bit 7 (2 DE 12 ). Machine worked.
Run margins up and down Banged on boards, etc. bugs didn't Found that wiping core 3 if 485 boards hard caused bits 3 & 4 to be c p ok split cycles. Couldn't make it go away, Checked sockets, changed cards, pinched connectors, no trouble formed troubles not there, Probably not related to " 033 bug " not related to " 033 bug ". [SRP] 26 Jan . Type 30 goes away randomly when viewing it. [--?] will come back again when [reinitalized?]. can't tell if Hardwood or softwood [Pingle?]
12 00 1/26/67 [D+H?] Drives 6 and 7 now have guides with no avoiding on the surface. After instalation ran Dectape Test with a static tape. No [Erross]
Fred Pa------?]
