Here is a simple idea for those who have three or more software-based ROMs for the BBC and do not, as yet, have a ROM extension board. What you probably have to do now is to keep opening the Beeb to change your ROMs. Instead, why not take one of your sockets outside?

Here's how. What you need is a 28 pin ZIF (zero insertion force) socket, about 1.5 metres of 28 way ribbon and a 28 pin DIL (dial in-line) plug.

You solder each pin on the ZIF socket to the corresponding pin on the 28 pin plug, or use insulation displacement connections. The DIL plug will go into one of the empty sockets and you stick (with double-sided sticky tape) the ZIF socket on the corner of your computer.

The items mentioned above are available from most electronics suppliers for under £10 (except for the soldering iron).

S. S. Alg
Fulham, London