Click Here to visit our Sponsor
The History of Computing The Magazine Have Fun there ! Buy goodies to support us
  Mistake ? You have mr info ? Click here !Add Info     Search     Click here use the advanced search engine
Browse console museumBrowse pong museum


Ready prompt T-shirts!

see details
ZX81 T-shirts!

see details
ZX Spectrum T-shirts!

see details
Spiral program T-shirts!

see details
Arcade cherry T-shirts!

see details
Atari joystick T-shirts!

see details
Battle Zone T-shirts!

see details
Vectrex ship T-shirts!

see details
Moon Lander T-shirts!

see details
Elite spaceship t-shirt T-shirts!

see details
Competition Pro Joystick T-shirts!

see details
Atari ST bombs T-shirts!

see details
C64 maze generator T-shirts!

see details
Pak Pak Monster T-shirts!

see details
BASIC code T-shirts!

see details
Breakout T-shirts!

see details
Pixel adventure T-shirts!

see details
Vector ship T-shirts!

see details

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).

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).

Special thanks to Daryl Maddox who donated us this computer !


I have a OSI C1P II with the 610 and floppy. I also have all of the manuals and software for it. I am going to be selling and wanted to see if there was any interest in it before I put it on Ebay.

Sunday 3rd April 2016
Mike (Lovettsville, VA)

I bought a superboard in 1979, my first computer. I learned software and hardware from it.
I upgraded to 32K and a floppy.
I designed and built an interface to a 3 voice sound chip and a TI "sprite" color graphics chip.
I showed my color c1p to the OSI club in Cleveland, a group of business users, and they wondered why anyone would need colors!

Wednesday 8th July 2015
harmon (Kent, Ohio USA)

HI, I was a technician back then and worked for OSI. I repaired many of these units. I am interested in purchasing some of the older units C1P, C2P, etc.

Thursday 18th December 2014
Dave Smith (USA)


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

Please buy a t-shirt to support us !
Ready prompt
ZX Spectrum
Arcade cherry
Spiral program
Atari joystick
Battle Zone
Vectrex ship
C64 maze generator
Moon Lander
Competition Pro Joystick
Atari ST bombs
Elite spaceship t-shirt
Commodore 64 prompt
Pak Pak Monster
Pixel Deer
BASIC code
Shooting gallery
3D Cubes
Pixel adventure
Vector ship

Related Ebay auctions in real time - click to buy yours

see more OHIO Scientific  Challenger 1P Ebay auctions !

Click here to go to the top of the page   
Contact us | members | about | donate old-systems | FAQ
OLD-COMPUTERS.COM is hosted by - NYI (New York Internet) -