SC1041_SAIL_PDP-6_hardware_log_1967-04

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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

Last edit about 5 years ago by shiiyuri
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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

Last edit about 5 years ago by shiiyuri
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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

Last edit about 5 years ago by shiiyuri
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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

Last edit almost 2 years ago by Lars Brinkhoff
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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.

Last edit about 5 years ago by shiiyuri
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