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.

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

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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