SC1041_SAIL_PDP-6_hardware_log_1967-09

at 0 isntead of 2277 as with all the previous writes. Also, only one sector is wiped out. Perhaps the disk is not stopping the write soon enough?

Trying to write the last or next-to last words of core onto the disk gives non-ex mem from IOP. It appears, however, that all the data gets transferred.

On backwards address testing, bit 21 began dropping at BAND= 16+8+2+1 TRK=9.

With random data BIT 21 dropped at BAND=128+8+4+2+1 TRACK = 1 SECTOR = 11+8+6+5+4+3+2 word q10. likewise word 14. likewise word 15. likewise word 17. ect. The effect is repeatable. Happens with test #9 also. Also with teset #1 (all 1 bits). Bit 21 of IOP SR flickers while writing.

John Sauter

1045 2-OCT-67

While running RANDOM DATA got READ ERROR at BAND=64+32+8 +4+1 TRK=1. DATA was OK.

First sector of BAND 64+32+4+2 TRK=0 contained data that had been there before the last write to that place.

Likewise 64+16+1 TRK=0. Read error at 64+4+2, TRK=1. DATA OK. Read error at 32+16+8+4+2 TRK=1. DATA OK. Read error at 16+4+2 TRK=1. DATA OK.

John Sauter

10/2/67 14:15

TTY ? converts A into @ I into [circle with line through] MEK

3-OCT-67 0010 Ran diagnositc bit 28 dropping, 3 picking up. J. Sauter

3. Oct. 67 0950 Put new ribbon in printer. TEST PRINT caused ribbon to move but nothing printed. Everything else OK. P????

1400 3 Oct 67 167 is dropping Bit 21 in MA lives.

[signature]

3-Oct-67 1559 FII trouble sometimes will not [illegible] rel - Y a abs which needs -Y [illegible] uses 0 [illegible] or -dif (abs)

[signature]

POS 0.0

rel 100,100 100, -100 100,100

No -100,-100

10/3/7 1720

TTY 7 Suddenly totally wretched in input mode -- Sends garbate back to printer -It' hard to explain -- try it yourself

[DLS?]

10-3-67

TTY 7 answers back off normal pressed Here is key and it cleared.

TTY 5 Steve RUssell tested it works OK

TTY 4 operator working and works ok Returns TTY 2 Set #39939 replaced all gears because of gear noise

Jess Gonzales

OCT 3 1967 2200

MA 22 lamp doesn't work on APU console. DATA MISS lamp on IOP doesn't work.

John Sauter

0015 4 OCT 67

167 [bung?] up with DATA MISSED

CON0 10,0 DATA0 10, [αwD 600000,0 DATA0 444, [0

DATA MISSED, SR RQ, BR RQ MA=42 WC = 600041 CHC=0 SWC = 3

0015 4 Oct 67 con't

Conclusion: Core 1 stored the 41 [word?] correct, but the 167 for some reason didn't reset BR RQ.

Tried J Sauter's diagnostic It was well

SRR

0100 4 Oct 67

Disk got 1 read error on random number test. Data was OK. Error was recoverable. Ran again and it worked.

There only remain 3 intermittents that have not been fixed. They are: the drop bit 38 and pick bit 3 of yesterday the MA bit 21 error which wouldn't stay around to be found the [?] up on first word of second sector. This wasn't investigated other than the deck that pulses are all there in normal case.

SRR

12:45 4 Oct 67

LPT has new coe wheel 1 amp assm. Checked all loss beards for proper output assorted skew-print delay Looked at [timeing?] chain and it was and they were okay + cleaned it up Adjusted [?]

Randy