Challenger 1P Computer

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The C1P series marked Ohio Scientific's 1978 formal entry into the low-cost, mass-marketed personal computer marketplace. The Challenger 1P computer is effectively a Superboard II single-board computer plus case and power supply. Features include:

  • A full 53-key ASCII-like keyboard.
  • NTSC video display with scrolling and character editing capability.
  • Cassette storage using the Kansas City audio cassette standard.
  • Microsoft 8K BASIC in ROM.
  • Machine code monitor in ROM.
  • A minimum of 4K RAM.
  • Full upper/lower-case capability.
The C1P can be expanded using the 610 accessory board. This allows up to 32K RAM and dual mini-floppies to be added, along with expansion to the model 620 BUS adapter.
  • CPU: 6502 microprocessor running at 1MHz.
  • The two system interrupts are routed to the model 610 expander board.
  • 8K BASIC-in-ROM plus 2K monitor ROM.
  • 6850 UART 300 baud cassette interface adapter.
  • Serial interface, capable of being routed to RS232 or printer ports.
  • Direct access 1KB video display capable of 32x32 characters (NTSC output).
  • Up to 8KB socketed RAM (4KB supplied by default).
Our C1P is in its original box and has a variety of software on home-recorded cassettes. It also comes with the following printed documentation:
  • The Challenger 1P Technical Report: A comprehensive discussion of the Ohio Scientific Personal Computer Systems.
  • Superboard II/Challenger 1P Users Manual (Preliminary).
  • Challenger Graphics Set reference card.
  • The Challenger Character Graphics Reference Manual.
  • The 8K BASIC-in-ROM Reference Manual.

Manufacturer: Ohio Scientific
Date: 1978

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Challenger 1P Computer Manuals:

Item Manufacturer Date
The Ohio Callenger 1P Technical Report Ohio Scientific Aug 1978
Ohio Superboard II & Challenger 1P preliminary Users Manual Ohio Scientific Aug 1978

Other Systems Related To Challenger 1P Computer:

Item Manufacturer Date
Ohio Superboard II Model 610 Ohio Scientific October 1978
Ohio Superboard II Model 610 (Wooden Case) Ohio Scientific October 1980

This exhibit has a reference ID of CH32413. Please quote this reference ID in any communication with the Centre for Computing History.


Challenger 1P Computer

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