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Based on my measurement today, Frank turned on 924 VA of motors--no problem w/ Elgar. (Just the 1401 fans were on, which draws 550 VA on Phase B, leaving a 850 VA margin on phase B, or 850*3=2.5 kVA of 3-phase motor startup power available. Which implies the motor startup surge that might trip the Elgar shutdown circuits was less than 2.7x static current.) Adding in the two motor nameplates Frank didn't turn on today (ribbon, chain), his total motor power will be about 1.2 kVA. An 18 kVA supply, with the 5 tape drives off, will allow for a 1403 surge of 18 kVA - 4 kVA (system static pwr) = 14 kVA / 1.2 kVA = 11x, which is better than the worst-case ratio I've seen (7 - 10x). The 729 tape drive power-on motors (2 belt, vacuum motor) are just 550W, half of 1403 and no problem either.
Ron Williams, Bob Erickson, Robert Garner and Tim trouble shot some bad lamp drivers and/or circuitry. The 8 light in the high order address display was stuck ON. They needed ALD 42.xx.xx so found the museum copy, and copied it and other documents into working master and working copies.
Ron Mak showed Van Snyder (author of 1401 Autocoder
program runable on a PC) and Ed Thelen Ron's JAVA
encapsulation of
- 1401 Autocoder by Van Snyder
- 1401 SIMH simulation program by
in a wonderfully user friendly development environment
complete with assembly text highlighting and break points,
single stepping, and memory displays. Ron is now working
on a console interface but the current version is so superior
to the command line interfaces that I want his alpha release *RIGHT NOW*.
Ron Williams, Bob Erickson, and Tim Coslet continued debugging the 1401.
Later Tim Coslet and Ed Thelen worked on the 026 key punch.
We found that reforming the 200v 200 ufd capacitor with a 4 watt
lamp eliminated the blowing of fuses and the machine now passes
cards to some extent. The rubber rollers on each side of the
read station are hardened and slicked and need to be resurfaced
or some chemical restorative is needed.
Tim got the 026 keypunch to duplicate :-)) , There still seems
to be a decoding problem in the keyboard preventing a 2 row
punch in alpha mode.
![]() Allen 729 Terms | ![]() 729 Mechanicals | ![]() 077 Naked | ![]() 3-48 shoulder Screw | ![]() Glenn Ed JToole |
![]() Bob 077 Timing Wheel | ![]() Bob 077 | ![]() Bill Glenn 729 Feeding Tape | ![]() Allen Glenn 729 How To | ![]() Allen Glenn 729-1401 Cables |
![]() | Don Cull &
Bill Flora, then and now :-))
(I guess the promotions weren't permanent, - Fame is so fleeting :-( Its 2005 and they are both back fixing the 1402 card reader/punch :-(( ;-)) |
![]() Ed-Have Core Will Fix | ![]() Ed Allen Glenn 729 Belts | ![]() Ed Allen 729 Debug | ![]() Dick Van Snyder | ![]() Bob Erickson ARC |
Computer History Museum staffers Kirsten Tashev (Vice President of Collections & Exhibitions) and Dag Spicer (Senior Curator) came down the the 1401 Restoration Room and stated that all future requests by the 1401 Team Volunteers for documentation/hardware should be written on the forms they provided. The Museum will try to make a response or request for clarification within a week.
Ron and Bob worked on the 077 collator and 1401. Without enough 50 Hz power to power all of 1401 memory, we cannot read any memory. - It was not a good day.