We hate 2020!

Just when we thought 2020 couldn't get any worse! We were about to re-open after many months of being closed but then disaster struck when a mains water pipe burst and flooded much of the ground floor of the museum.
Sadly re-opening has now been postponed. Read More >>>

Please Donate Via Just GivingNo visitors, no workshops, no events, no school visits... no income. We know that things are tough for everyone right now, but if you can afford to help us through these tough times please donate what you can.

There's over 36,000 exhibits here! That should keep you occupied for a bit - get searching!

Or come and get involved on our social media channels ...

      Twitch  Facebook          Online Gift Shop      

Thank you.

Challenger 1P Computer

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.
Specifications:
  • 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



Comment on This Page

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


Click on the Image(s) For Detail


Articles

Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum