Attendees: Ron Williams, Bob Erickson, Robert Garner, George Ahearn, Stan Paddock, Frank King, Douglas Martin, Bill Newman, Joe Preston, Ed Thelen, Allen Palmer, Ron Crane, Judith Haemmerle
Due to technical difficulties, the video portion of this blob has been interrupted.
While pictures were taken on March 9th, the camera used to take the pictures has decided to hide. Anyone knowing the whereabouts of the silver Kodak camera is urged to notify your local police department.
Allen Palmer and Joe Preston continue their work on tape drives number two and three of the German IBM 1401 system.
Bob Edwards and Judith Haemmerle continue their work on the IBM Model 'B' Transmitting typewriter.
Ron Williams continue on the read problems associated with the Connecticut IBM 1401 system. Every other card that has an odd number of rows punched will be flagged as an error. For those of you that know IBM 1401 systems, this is a error associated with the 'X' check memory plane.
Ron Crane and Stan Paddock continue to work on the power input to the German IBM 1401 system. The power distribution was as follows.
Ron investigated and found the fans (35) were all powered from lea 'A'.
We moved the fan load from leg 'A' to leg 'C'. The power distribution is now as follows:
It does not get any better than that.
Now that the legs are balanced, we will work on the power factor. With the leg load and power factor controlled, the loading on the Pacific power converter will be much lower.
During our tests, we found that two of the linear amplifiers in the converter are not performing up to their full ratings. These will be fixed or replaced from our spares.
With an invitation from Karen Kroslowitz, Bill Newman and Doug Martin visited the CHM warehouse in Milpitas. They were looking for some interconnecting cables for the IBM Model 'B' Transmitting typewriter. Two matching typewriters were found but they were both associated with the stored IBM 1620. While they were offered to us because they were already 'service' status, Bill and Dough did not want impact a future revival of the 1620.
| German IBM 1401, 1402, 1403, 1406, (1) 729 | 220/380 3Ǿ 50 Cycles | 10.85 | 2,387.00 | 53.06% |
| 220/380 3Ǿ 50 Cycles | 7.05 | 1,551.00 | 34.47% | |
| 220/380 3Ǿ 50 Cycles | 2.55 | 561.00 | 12.47% | |
| Total of three phases | 20.45 | 4,499.00 | 100.00% |
Ron investigated and found the fans (35) were all powered from lea 'A'.
We moved the fan load from leg 'A' to leg 'C'. The power distribution is now as follows:
| German IBM 1401, 1402, 1403, 1406, (1) 729 | 220/380 3Ǿ 50 Cycles | 6.80 | 1,496.00 | 32.03% | ||
| 220/380 3Ǿ 50 Cycles | 7.01 | 1,542.20 | 33.02% | |||
| 220/380 3Ǿ 50 Cycles | 7.42 | 1,632.40 | 34.95% | |||
| Total of three phases | 21.23 | 4,670.60 | 100.00% |
Now that the legs are balanced, we will work on the power factor. With the leg load and power factor controlled, the loading on the Pacific power converter will be much lower.
During our tests, we found that two of the linear amplifiers in the converter are not performing up to their full ratings. These will be fixed or replaced from our spares.
With an invitation from Karen Kroslowitz, Bill Newman and Doug Martin visited the CHM warehouse in Milpitas. They were looking for some interconnecting cables for the IBM Model 'B' Transmitting typewriter. Two matching typewriters were found but they were both associated with the stored IBM 1620. While they were offered to us because they were already 'service' status, Bill and Dough did not want impact a future revival of the 1620.
There is a section of the Connecticut IBM 1402 that has been missing since we received the machine. While it is not required for the functioning of the machine, it does expose some electrical and mechanical dangers to the operators.
We removed the missing pieces from the German IBM 1402 and Bill and Doug took them with them to the warehouse to see if any of the stored IBM card machines matched what we need.
The guys found several close calls but only the IBM 1402 from Visible storage had the right parts. These are not available to us as it is a part of the permanent collection.
We had three couples who found there way down the hall and wondered what was going on in the 1401 Restoration room. They got the usual "Data Processing in the 1960s" dog and pony show. They seemed to enjoy it as much as I enjoy giving it.
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