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O > OHIO SCIENTIFIC  > Challenger 1P   

OHIO Scientific
Challenger 1P

Ohio Scientific, based in Ohio, USA, were the makers of the Superboard II. The Challenger 1P and Challenger IIP-MF were essentially cased versions of this single board system with integrated keyboard, a single 5Volt power supply and the first 6502 version of Microsoft BASIC interpreter.

An optional floppy disk controller and a extra 24K of ram for this unit was available using a 610 expansion board.

The C1P-MF was an upgraded version of the C1P having 20 KB of RAM and one 90 KB floppy disc drive. Memory could be upgraded up to 32 KB.

The Superboard and its derivatives had good user support and many programs were available.


Some additional information from Mark Alsing:
It had basic keyclick sound capability that could be added by popultaing components (resitors and caps) on the main board.An RS-232 interface could also be added this way and there was a cut-out on the back to mount a DB-25 connector for it. Video output was composite and required an RF modulator to display output on a regular TV. I had a MicroVerter box that put the output on ch. 13 or 14.

Ken Jordan, a game developer who got his start on the OSI-C1P, reports :
The text mode was really 32 x 32, but because of TV overscan only 24 x 24 was used.
As was common, I soldered Atari joysticks to the numeric keys to allow gaming (there was a standard for this mod).

NAME  Challenger 1P
TYPE  Home Computer
YEAR  1979
KEYBOARD  Full stroke 53 keys
CPU  6502
RAM  4 KB (static) expandable to 8 KB on board
TEXT MODES  24 chars. x 24 lines
GRAPHIC MODES  Only built-in graphic characters
COLORS  Monochrome
SOUND  No sound
SIZE / WEIGHT  Unknown
I/O PORTS  Tape recorder (input/output jacks for 300 baud Kansas City Standard tape storage), Composite video
POWER SUPPLY  Built-in 5V power supply unit
PERIPHERALS  24 KB memory board, floppy discs
PRICE  About $350

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