Acorn System 4
 | |
| Acorn System 4 (double-height rack) | |
| Specifications | |
|---|---|
| Manufacturer | Acorn Computers Ltd |
| Type | Modular microcomputer (Eurocard) |
| Released | 1980 |
| Intro price | £1525 (with casing, PSU and 16 KB RAM, 1982) |
| CPU | 6502 @ 1 MHz |
| Memory | 16 KB RAM (minimum) |
| Storage | Two 5.25" floppy disc drives |
| Display | 40×25 teletext VDU |
| Sound | — |
| OS / Firmware | Acorn DOS |
| Predecessor | Acorn System 3 |
| Successor | Acorn System 5 |
The Acorn System 4 (1980) was a larger version of the Acorn System 3, housed in a double-height rack with a 14-slot lower frame and two floppy-disc drives in the upper half.[1] The extra slot capacity made it suited to roles such as an Econet file server.
Configuration
[edit | edit source]The minimum System 4 contained a 1 MHz 6502 CPU card, a VDU card, 16 KB of RAM and a floppy-disc controller with two drives mounted in the top half of the rack; further Eurocards could be added in the 14-slot lower frame.[1][2] A documented example fit includes the 6502 CPU card (with a System keyboard connector), an 8 KB static RAM card, a 40-column VDU card, an Econet card, a Universal Interface Board and a Bus Extender, on a 14-slot backplane.
In 1982 the System 4, with casing, power supply and a basic 16 KB of RAM, cost £1525, plus extra for the keyboard.[1]
Maintenance and repair
[edit | edit source]- Acorn System 4 Maintenance Guide
- Acorn System 4 Troubleshooting Guide
- Acorn System 4 Capacitor Replacement Guide
See also
[edit | edit source]References
[edit | edit source]- ↑ 1.0 1.1 1.2 "Acorn System", Wikipedia. Source for the System 4 double-height frame (14 lower slots, two drives above), the minimum configuration and the 1982 price.
- ↑ Whytehead, Chris. "Acorn System 4", Chris's Acorns / The Centre for Computing History. Source for the 14-slot double-height frame, the minimum configuration, and the example card set (CPU with System-keyboard connector, 8K static RAM, 40-column VDU, Econet, Universal Interface Board, Bus Extender) on a 14-slot backplane.