External ROM Expansion unit for the BBC Model B Plus

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The external ROM expansion unit for the B plus is designed as a plug-in unit to allow easy expansion of total ROM capability up to the maximum the system will allow. An alternative set of ROMs may also be selected if 32K ROMs are fitted by means of a front panel switch or by fitting a second card if 16K ROMs are fitted.

The unit consists of two parts:


  • A driver card which fits inside the computer into one of the ROM sockets.
  • A cream painted steel case housing a mains derived power supply together with a ROM expansion card.
The two units are connected together via a 34-way ribbon cable. The case has a hinged top cover allowing easy access for inserting or replacing ROMs without continually opening up your computer.


Date : Unknown

This exhibit has a reference ID of CH34743. Please quote this reference ID in any communication with the Centre for Computing History.

Scan of Document: External ROM Expansion unit for the BBC Model B Plus

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