This was the final BBC model, it squeezed every last bit of memory out of the 8-bit computer. It is the same as the BBC Model B+ 64K with the addition of a further 64K RAM which is used as sideways RAM and can have ROM images loaded into it. Compared to the BBC Model B, it has:
A redesigned motherboard with the ROM sockets moved to the lefthand side of the board so that they are not covered by the keyboard.
Tthe 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
It was launched in 1984 shortly after the BBC Model B+ 64K and was soon replaced by the BBC Master.
For further details visit http://chrisacorns.computinghistory.org.uk/Computers/BBCB+128.html
Our model is in excellent condition with all the original packaging. The serial number is:
Other Systems Related To BBC Micro B+ 128K + 48K ROM:
This exhibit has a reference ID of CH28847. Please quote this reference ID in any communication with the Centre for Computing History.
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