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Recreating the lost SDK for a 42-year-old operating system: VisiCorp Visi On
Back in 1983, an office software giant VisiCorp released a graphical multitasking operating system for the IBM PC called VisiOn (or Visi On, or Visi-On, it was before the Internet, so anything goes). It was an "open system", so anyone could make programs for it.
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