Pages
21
2345 3 may 67
Mag Tap disconnect bug did not repeat.
SRR
0815 4 May 67
TTY2 is missing characters or something funny is happening. The system is not dead. But it doesn't seem to listen to TTY2
Raj Reddy
1815 4 May 67
Clock 1 and Clcok 3 of A-D seem to be recording much faster than their rated speed. Using 20 KC clock 9 can only get about .5 to .6 seconds of speed instead of 1.5 second into a buffer of 10,00 words
(Sorry my mistake Raj 5 May)
Raj Reddy
2215 4 May 67
Chased MAG TAPE bug
Found a read error with 570/516 data test. Cleaned .545 tape path thoroughly. Error went away
22
2215 4 May 67
Raj Reddy's errors still were [here?]
They showed as:
1) missing characters in records (- Probably pgm bug 5 May 67 SRR)
2) getting into skip to (infinity) mode
current state:
Time shared programs fail
Bare machine tasks work.
Also cleaned all [dectapes?]. No noticeable improvement in their performance either.
SRRussell
(crossed out:) 2230 4 May 67 Calling the dataphone teletape seems to
910 5 May 67
CTY gives many lines for 1 line feed, somtimes
SRRussell
23
1155 5 May
Terminating resistors on MRS pulses to each core box have been changed from 100Ω to 47Ω in hope that it stops the noise bug on these pulse lines and put and end to the mystical core hang up bug - let us see.
Randy
10:30 Ran dectape test as follows
Unit 3 UTEST, DCTEST, EXDATA
On one scratch tape use EXDATA found some bad block marks but ran fine with another scratch tape. Ran ALLMODE on bad tape and then ran EXDATA again. Its now good tape. All in all the units tested seemed okay.
Randy
11:55 TS Main ran fine for 10 min. Auto BLT for 13 min an it to is okay.
SNAFU
Randy
24
5:50
LPT had been cleaned up. I took cover off drum an scrubbed it down, aligned tractors, vaccummed it out and adjusted hammer penitration etc.
Randy
5/8/7
Carriage screwed up on TTY3 - - won't move
DCS
5/8/7 TTY3 Dash pot has bad rubber bumper pluck, sometimes it wedges it self. Its to loose no replacement for it - wrapped tape on it to help it seat tighter.
Randy
Got new part from PDP-1 it works. Randy
8 May 67 1030 TTY 1
Sends double characters A + Carriage return
SRRussell
5/8/67
DTC has been checked over and this is what we found.
The margins in dectape control [works?] okay, but for 1A to 0A, -2V was as far as it would go
I made up two 1033 pads and [stove?] and I checked margins + the lineup for 4523 Manchester
25
boards and found the mark tic reader amp (1A24) marginal - after I tweaked it margins are now 1A + 10A -4.5V +5
Seems to work fine now
PS Line up procedure was from A-551P dectape control 551 preliminary Page 6-6, 6-7
4 Sec turn around prog for test:
TIME DELAY WRONG, ADJUST
also with DT test 37/37777 77777
PROCEEDING
40000/ TIME VERT, @62001 (ARRAY) CONO 210, 337030
40001/ STATUS RAN, @62176(AC) HRLI 0,2
40002/ TIME VERT, @62003 (ARRAY) SOJGE 0,.
40003/ STATUS ERR, 62210 (RAN) CONO 210, 327030
40004/ TIME VERT, @62005 (ARRAY) HRLI 0,2
40005/ STATUS ERR, 62222 (WCMA) SOJGE OXXX SOJGE0,u SOJGE 0,.
40006/ TIME VERT, @62007 (ARRAY) JRST 40000
5/8/67
Randy
1815 8 May 67
Tried Bill Weiker's famous old marginal dectape. It's still marginal DAMIT!
SRRussell
Sorry about that chief.