keypunch.icn: Program to simulate a keypunch

February 7, 1995; Gregg M. Townsend
Requires: Version 9 graphics
This file is in the public domain.
   In the olden days, computer data was encoded by rectangular holes
punched in thin pieces of cardboard about the size of an old dollar.
This program simulates a "keypunch", a mechanical device for punching
those holes.  (Keypunches themselves were programmable, but there's
no way to program this one; tab stops are set permanently.)

   A carriage return feeds a new card.  Illegal characters punch a
lace column.  As with a real keypunch, you can backspace, but the
holes don't go away.

   The shift key turns "UIOJKLM<>" into "123456789".  The meta key
serves (imperfectly) as the multipunch key.

   The font was chosen on a Sun workstation and may not be portable.

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