What have I done:
August 1966 - April 1970:
- I worked as an operator, analyst and programmer on the migration of all applications running on an IBM 1401 towards an IBM 360/40 mainframe.
April 1970 - February 1972:
- I was enlisted in the Royal Netherlands Air Force, and worked as a sergeant specialized in communication and cryptography.
February 1972 - February 1974:
- I worked as an analyst/programmer on the development of a material management system, billing system and cost-price calculations (IBM 370, batch applications in COBOL with IDMS-DB)
What did I learn:
In this job I learned all elementary skills to build and implement good programs. More specifically I learned to make effective use of the very limited capabilities that were available in that time-frame. The first IBM 'mainframe' that I worked with had an internal memory of 12Kb and an external RAMAC disk unit with a capacity of 1Mb and all information should fit on an 80 column (=bytes) punch-card.