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
77 lines
2.5 KiB
Markdown
77 lines
2.5 KiB
Markdown
---
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title: SHELTON INSTRUMENTS Sig-Net
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categories:
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- Computers
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types:
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- Professional Computer
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origins:
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- United Kingdom
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years:
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- '1981'
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cpus:
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- Z80-A
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params:
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name: Sig-Net
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image: /media/museum/photos/shelton_signet_system_1.jpg
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company: /companies/shelton-instruments
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company_name: SHELTON INSTRUMENTS
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specs:
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- label: NAME
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value: Sig-Net
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- label: MANUFACTURER
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value: Shelton Instruments
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- label: TYPE
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value: Professional Computer
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- label: ORIGIN
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value: United Kingdom
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- label: YEAR
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value: '1981'
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- label: BUILT IN LANGUAGE
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value: None
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- label: KEYBOARD
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value: Depending on the video terminal used
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- label: CPU
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value: Z80-A (or B)
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- label: SPEED
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value: 4 MHz.
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- label: CO-PROCESSOR
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value: None
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- label: RAM
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value: 64 KB to 128 KB (one-processor system)
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- label: ROM
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value: 4 KB
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- label: GRAPHIC MODES
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value: A graphic card was available - Features unknown
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- label: SOUND
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value: Beeper
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- label: SIZE / WEIGHT
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value: Unknown
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- label: I/O PORTS
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value: 2 x Serial RS232, 1 x Parallel Centronics
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- label: BUILT IN MEDIA
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value: 1 to 4 200, 400 or 800 KB 5'' floppy disc drives
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- label: OS
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value: CP/M
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- label: POWER SUPPLY
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value: Built-in power supply unit + one power supply per card
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- label: PERIPHERALS
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value: Optional 7 MB hard disk (£3300 + £600 for the controller)
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- label: PRICE
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value: Basic version (200/2) about $2900 + video terminal
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forum_thread: 791
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oc_id: 810
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source:
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url: https://web.archive.org/web/20230528100258/http://www.old-computers.com/museum/computer.asp?c=810
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date: '2023-05-28'
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---
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Shelton Instruments were the people behind the original design of the Nascom 1. They were based in London.
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Sig-Net was a totally new concept, whereby a series of boards - processor, interface, memory, etc. - were interconnected by flexible wires.
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Each board had its own power supply and many variations of computer could be evolved from the basic system components.
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The Sig-Net 200 series computer had a number of these modules housed in an enclosure that can have two integral floppy disc drives. The system came with 64 KB of RAM and up to 4 KB of ROM. There were two RS232 interfaces and a 4-channel real-time clock.A hard disk controller could be connected on-board.
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The system was indefinitely expandable, even to a multi-processor system, using Sig-Net modules. CP/M 2.2 operating system came with the computer allowing the vast CP/M library of software to be used.
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