Software Design, 1980 Style

Mrs. Dutchoak is cleaning out the attic. Out come Dutchoak's treasured gems: his software development work from 1979-1981. 
Looking closer and with today's knowledge it is terribly written, not maintainable at all, but in these days it was up to par and quite clever.

It was all designed with paper, pencil and a flowchart diagramme template.