yann64andClaude Opus 5.5
b274874139
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
73 lines
2.1 KiB
Markdown
73 lines
2.1 KiB
Markdown
---
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title: OHIO Scientific MODEL 500
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categories:
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- Computers
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types:
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- Home Computer
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origins:
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- U.S.A.
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years:
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- '1977'
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cpus:
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- '6502'
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params:
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name: MODEL 500
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image: /media/museum/photos/ohio-scientific_challenger_500.jpg
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company: /companies/ohio-scientific
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company_name: OHIO Scientific
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specs:
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- label: NAME
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value: MODEL 500
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- label: MANUFACTURER
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value: OHIO Scientific
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- label: TYPE
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value: Home Computer
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- label: ORIGIN
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value: U.S.A.
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- label: YEAR
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value: '1977'
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- label: CPU
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value: '6502'
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- label: SPEED
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value: 1 MHz.
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- label: RAM
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value: 4 KB
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- label: ROM
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value: 8 KB
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- label: TEXT MODES
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value: 24 chars. x 24(?) lines
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- label: GRAPHIC MODES
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value: None
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- label: COLORS
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value: Monochrome
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- label: I/O PORTS
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value: Tape, Monitor, 1 expansion slot
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- label: PRICE
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value: 'Model 500: $298 - SuperKit: $398'
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tabs:
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- photos
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forum_thread: 65
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photos:
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- title: THE MODEL 500 SUPERKIT
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subtitle: ''
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text: '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.'
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image: /media/museum/photos/challenger_superkit.jpg
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- title: MODEL 500-1
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subtitle: ''
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text: ''
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image: /media/museum/photos/ohio_500_version1_1.jpg
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oc_id: 49
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source:
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url: https://web.archive.org/web/20230327103016/http://www.old-computers.com/museum/computer.asp?c=49
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date: '2023-03-27'
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---
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This board was used as a motherboard for the [Challenger II](/museum/ohio-scientific-challenger-ii/).
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Three Model 500 versions were sold:\
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**500**: The board.\
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**500-1**: Fully enclosed board with power supply, reset switch and two standard terminal connectors.\
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**500-8**: A 500 board in an eight slot Challenger case with power supply.
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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
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