Tales of IBM

   I joined IBM in 1963 and began working on Unit Record installations (punch card equipment). I found the work sometimes challenging but always enjoyable, as I’ve noted elsewhere in this thread. I moved from a sales office to a datacenter in the TimeLife building in NYC. In addition to the datacenter, IBM had an education center and part of Systems Development Division. In the datacenter, I learned the 1401, 1460, 7090, 7044 and 7044/94 Directly Coupled System which used the 7044 as a front-end for I/O and job scheduling and let the 7094 devote itself to number crunching.
   When the System /360 was announced in April 1964, we were all given a day’s “training” but only the senior Systems Engineers really got their hands on the new system initially. I recall all of us being puzzled about how the /360 could have 16 Condition Codes expressed with only two bits. It took awhile to get our heads around that and it still confuses people new to the hardware. Continue reading