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First lessons in extensibility were in BASIC, when the very young future software designer strategized line number increments.

• knuckleheadsmif 4y ago
  Anyone whoever programmed on punch cards always numbered them so the you could sort them if you ever dropped your deck. Strategic numbering was even more important then. Most of us preprogrammed the punch machines, via a punch card itself mounted to a drum, to help with the numbering.
  • greenbit 4y ago
    Don't forget to draw a diagonal line across the side of your card deck. Don't skimp and use a pencil, get a nice felt tip marker.
  • Gibbon1 4y ago
    My dad said guys he worked with back in the 1960's would have stacks of library routines on punch cards that they would assemble their programs from with a minimal amount of purpose written code. Once it was finished they run the stack through a duplicator that would also renumber the cards. Then they'd take the original deck and stick the library functions back in their library.