website/content/museum/ohio-scientific-model-500.md

title, categories, types, origins, years, cpus, params

title	categories	types	origins	years	cpus	params
OHIO Scientific MODEL 500	Computers	Home Computer	U.S.A.	1977	6502	name image company company_name specs tabs forum_thread photos oc_id source MODEL 500 /media/museum/photos/ohio-scientific_challenger_500.jpg /companies/ohio-scientific OHIO Scientific label value NAME MODEL 500 label value MANUFACTURER OHIO Scientific label value TYPE Home Computer label value ORIGIN U.S.A. label value YEAR 1977 label value CPU 6502 label value SPEED 1 MHz. label value RAM 4 KB label value ROM 8 KB label value TEXT MODES 24 chars. x 24(?) lines label value GRAPHIC MODES None label value COLORS Monochrome label value I/O PORTS Tape, Monitor, 1 expansion slot label value PRICE Model 500: $298 - SuperKit: $398 photos 65 title subtitle text image THE MODEL 500 SUPERKIT The Superkit is a kit with several boards : an expansion board with 8 slots, the Model 500 board and a card called Model 440 Video I/O board. This card provides CRT functions and a keyboard connector. /media/museum/photos/challenger_superkit.jpg title subtitle text image MODEL 500-1 /media/museum/photos/ohio_500_version1_1.jpg 49 url date https://web.archive.org/web/20230327103016/http://www.old-computers.com/museum/computer.asp?c=49 2023-03-27

This board was used as a motherboard for the Challenger II.

Three Model 500 versions were sold:
500: The board.
500-1: Fully enclosed board with power supply, reset switch and two standard terminal connectors.
500-8: A 500 board in an eight slot Challenger case with power supply.

OHIO Scientific presented later an enhanced version called SuperKit. It was a 3 board-set with a Model 500 board without the serial interface, a video board, a 8 slot backplane board and a modified version of the BASIC ROM allowing a direct use of the video board. A TV set could be used with an optional RF aerial modulator