Torch C-500

The Torch C-500 was a communicating business computer built around BBC Micro technology and a dedicated Z80 second processor. It combined familiar 6502 display and input hardware with the CP/M-compatible CPN environment, disk storage, networking and an integral modem.

Torch’s Communicator concept turned Acorn’s educational architecture into a connected office workstation. Users could exchange electronic mail over telephone lines or Torchnet while running established Z80 business software.

Notable Features

• Dual-processor design paired a BBC-derived 6502 system with a 64KB Z80A environment.
• Integral modem and Torchnet interfaces emphasised electronic communication.
• CPN provided CP/M application compatibility together with networking and graphics.

Historical Significance

• One of the earliest British microcomputers designed around networking and electronic mail.
• Established Torch as a manufacturer of complete business systems rather than only BBC Micro peripherals.

Collector’s Notes

• C-500 configurations vary in disk and communications hardware.
• CPN system disks, modem approvals and matching storage units are important parts of a complete installation.

Specifications

Technical Information
Name	Torch C-500
Manufacturer	Torch Computers
Launched	Friday, January 1, 1982
Country	United Kingdom
CPU	MOS 6502A with Zilog Z80A second processor
Units Sold
Operating System	BBC MOS and Torch CPN, compatible with much CP/M software
I/O	Modem, RS-423, parallel, analogue, cassette and Torchnet/Econet-style network
Keyboard	Integrated or matched business keyboard
Storage	Floppy or hard-disk units depending on configuration
Sound	BBC-compatible sound system
Graphics	BBC Micro graphics modes with CPN support
Display	RGB, UHF or monitor output; BBC-compatible text modes
ROM	BBC and Torch MCP/CPN firmware
RAM	BBC system memory plus 64KB dedicated to the Z80
CPU Speed	6502 and Z80A, model-dependent clocks