Acorn BBC Master 128

The Acorn BBC Master 128 modernised the BBC Micro architecture with a 65C12 processor, 128KB RAM, expanded ROM software, cartridge slots and a numeric keypad. It integrated the disc hardware that had commonly been optional on earlier models.

The Master 128 became Acorn’s principal 8-bit education computer and the base platform for several specialised co-processor versions.

Notable Features

• Western Design Center 65C12 at 2 MHz forms the centre of the system.
• The standard memory and storage configuration was 128KB RAM and Cassette and built-in WD1770 floppy controller; optional hard disc.
• Its principal display arrangement was Television, composite video or RGB monitor.

Historical Significance

• The Master 128 became Acorn’s principal 8-bit education computer and the base platform for several specialised co-processor versions.
• This page represents a distinct Acorn model rather than a regional, memory-only or bundled-software variation.

Collector’s Notes

• Original keyboards, power supplies, manuals, expansion cards and storage hardware materially improve a surviving system.
• Internal revisions and dealer-installed upgrades mean an individual machine should be checked against its serial label and fitted hardware.

Specifications

Technical Information
Name	Acorn BBC Master 128
Manufacturer	Acorn Computers
Launched	Wednesday, January 1, 1986
Discontinued	1993
Launch Price	£499
Country	United Kingdom
CPU	Western Design Center 65C12 at 2 MHz
Units Sold
Operating System	Master MOS 3.20 with BBC BASIC IV
I/O	RGB, composite, UHF, RS-423, analogue, user, printer, 1 MHz bus, Tube, cartridge and optional Econet
Keyboard	Integrated keyboard with numeric keypad and ten function keys
Storage	Cassette and built-in WD1770 floppy controller; optional hard disc
Sound	Texas Instruments SN76489; three tone channels plus noise
Graphics	BBC display modes with shadow-screen memory
Display	Television, composite video or RGB monitor
ROM	128KB ROM containing MOS, BBC BASIC IV, View, ViewSheet, Edit, DFS and ADFS
RAM	128KB RAM
CPU Speed	2 MHz