Computer Museum - BBC Master  
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In 1986 the BBC Master was introduced with 128KB of memory. It addressed the memory shortage of the Model B but there were compatibilty issues. Most software continued to be written for the older machine.
BBC Master computer. Serial 01-AMB15-0088690.
BBC Master User Guide. Acorn Computers Limited / British Broadcasting Corporation.
BBC Master Welcome Disc. ADFS format.
Fitted ROMs. View (*WORD), Viewsheet (*SHEET), Wordwise Plus (*WORDWISE).
View User Guide.
Viewsheet User Guide.
Wordwise Plus. A User's Guide. Bruce Smith / Collins.
One of the cartridge slot covers is loose and is taped-up.
The Master has all the same connection possibilities plus two cartridge slots on the top. It also features a numeric keypad. The disc system was updated to ADFS, Advanced Disc Filing System, although the earlier DFS is still available. There are also updated versions of BASIC and the operating system. Software titles View, Viewsheet, Edit and Terminal are included in ROM. My Master also has the Wordwise Plus wordprocessor.
Rear connections: Econet, Audio out, Cassette, RS423, Analogue in, RGB, Composite video, UHF TV.
Front connections: Tube (for second processor), 1MHz bus, User port, Printer port, Disc drive, Auxilliary power output.
A version called the Master Compact followed with a separate keyboard and there was also a bigger Master 512 but the era of 8-bit computers was coming to an end and these were too late to make a real impact.
The BBC Master has an on-board battery which allows the computer settings (CMOS) to be retained while the power is off. These batteries need to be replaced regularly or they may leak and cause serious damage to the components of the computer. The correct battery pack is essential. The Master was designed to have a rechargeable battery but problems quickly emerged. As a result, rechargeable batteries must not be used nor can regular batteries unless they are fitted with the correct diodes. Replace the battery every 3 to 5 years.
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