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4 revisions	Khufu at Oct 16, 2023 01:00 AM	Compared with
Oct 16, 2023 Khufu Oct 05, 2020 Soazdrmm Jul 23, 2020 awhtou Mar 30, 2018 Stanford University Archives	51 [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)	51 [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 joing 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 cary into bit 1 from bit 2 was failing, independent of margins on 2E, F, H, J. (note no margins on 2D which probalby explains it.) found 6205 for bit 3 was very sensitive to mechanical shock. traded bit 1 and bits 2. Machine back at 1630 (over)

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