God N

Champaign-Urbana IL, Ca. 1984

My Computerized Version of Thompson’s “Abacus”
Note: Shows the same date as previous slide
Features:
  • “Dots” used as counters
  • Special counters for 5 (bar)
  • Rules need not be memorized
  • Automatic calculation
  • Uni-directional: goes from LC to CR only
X Windows Abacus

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