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Marzipan the cat computes the value of Pi on a recent addition to the collection, the APF Mark 231.

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Miscellaneous documents

  • [GIF] HP-150 Development (Contributed by Gene Wright)
  • [GIF] HP-67 Simulators (by David A. Munroe)
  • OCW-1401 advertisement
  • [GIF] Here Are The New Programmable Calculators (Popular Electronics, May 1976)
  • PPC CHHU & EduCALC Phone Bulletins (by Richard J. Nelson; audio contributed by Palmer Hanson)
  • [GIF] Rockwell Development (Contributed by Gene Wright)
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