Model B plus

The Model B+ was released in 1984 as a refinement of the original Model B's design. Acorn slightly redesigned the motherboard and fitted at first 64K and later 128K RAM (via a rather haphazardly fitted additional daughterboard). The most notable change was the ROM sockets, which were moved from their inconvenient position under the keyboard to the upper left of the motherboard. The MOS was updated, noticeably displaying 'Acorn OS' in the place of 'BBC Computer' in the startup message

The Model B+ was essentially a stop-gap machine to bridge the gap between the Model B and the coming Master Series. While the B+ did certainly offer a few worthwhile improvements to the Model B's design it still had all the hallmarks of mutton dressed as lamb, including the cheap-looking stickers applied to dress up later 128K models. The market was apparently unimpressed as the B+ did not sell in the quantities of the earlier models.