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Shelton Instruments were the people behind the original design of the Nascom 1. They were based in London.

Sig-Net was a totally new concept, whereby a series of boards - processor, interface, memory, etc. - were interconnected by flexible wires.

Each board had its own power supply and many variations of computer could be evolved from the basic system components.

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.

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.

NAME  Sig-Net
MANUFACTURER  Shelton Instruments
TYPE  Professional Computer
ORIGIN  United Kingdom
YEAR  1981
KEYBOARD  Depending on the video terminal used
CPU  Z80-A (or B)
RAM  64 KB to 128 KB (one-processor system)
GRAPHIC MODES  A graphic card was available - Features unknown
SOUND  Beeper
SIZE / WEIGHT  Unknown
I/O PORTS  2 x Serial RS232, 1 x Parallel Centronics
BUILT IN MEDIA  1 to 4 200, 400 or 800 KB 5'' floppy disc drives
POWER SUPPLY  Built-in power supply unit + one power supply per card
PERIPHERALS  Optional 7 MB hard disk (£3300 + £600 for the controller)
PRICE  Basic version (200/2) about $2900 + video terminal

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