Three years after the release of the BBC Microcomputer Model A and B, the BBC Microcomputer Model B+ was released in mid-1985. The Model B+ 64K increased the BBC Micro's memory from 32K to 64K. It was also available with 128K, as is the case with this model.

Compared to the Model B, the + has:

• a redesigned motherboard with the ROM sockets moved to the left side of the board so that they are not covered by the keyboard.
• the CPU is changed from a 6502 to a 65C12
• a new OS version 2.00 to support the new features. The startup messages is changed from "BBC Computer" to "Acorn OS"
• a Western Digital 1770 disc controller, instead of the Intel 8271, which supports ADFS as well as DFS
• a new DFS version 2.10 to support the WD1770
• additional 32K RAM with 20K for shadow video memory and 12K workspace
• additional 2 ROM expansion sockets
• The 128K has a 48K ROM, expandable to 192K

Manufacturer: Acorn
Date: July 1985

This exhibit has a reference ID of CH61486. Please quote this reference ID in any communication with the Centre for Computing History.

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