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.
BUILT IN LANGUAGE
Depending on the video terminal used
Z80-A (or B)
64 KB to 128 KB (one-processor system)
A graphic card was available - Features unknown
SIZE / WEIGHT
2 x Serial RS232, 1 x Parallel Centronics
BUILT IN MEDIA
1 to 4 200, 400 or 800 KB 5'' floppy disc drives
Built-in power supply unit + one power supply per card
Optional 7 MB hard disk (£3300 + £600 for the controller)
Basic version (200/2) about $2900 + video terminal