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.
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NAME | Sig-Net |
MANUFACTURER | Shelton Instruments |
TYPE | Professional Computer |
ORIGIN | United Kingdom |
YEAR | 1981 |
BUILT IN LANGUAGE | None |
KEYBOARD | Depending on the video terminal used |
CPU | Z80-A (or B) |
SPEED | 4 MHz. |
CO-PROCESSOR | None |
RAM | 64 KB to 128 KB (one-processor system) |
ROM | 4 KB |
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 |
OS | CP/M |
POWER SUPPLY | Built-in power supply unit + one power supply per card |
PERIPHERALS | Optional 7 MB hard disk (?300 + ?00 for the controller) |
PRICE | Basic version (200/2) about $2900 + video terminal |