The PROJECT EXPANSIONS SOUND EXPANSION CARTRIDGE is a 9cm x 11cm x 1.5cm black interface, cased by Care Electronics and bearing a white sticker. It has a speaker mounted on its back and connects to the ROM cartridge sockets of an ACORN PLUS 1/AP1 or ROMBOX+ extension. A female plug on its top connects to headphones, a female plug on its left to speakers. It also sports a 8K Sideways RAM socket into which a ROM image may be loaded.

The SOUND EXPANSION is enabled with a star command from the on screen cursor. Once operational, all sound is emitted not from the internal keyboard speaker but instead through its speaker. The protruding white knob on some, but not all, models can be turned to increase the volume as appropriate. On other models, turning a screw with a normal screwdriver has the same effect.

The SOUND EXPANSION will play sound on all four channels, allowing all the impressive music demos written for the BBC Micro to play on an ACORN ELECTRON fitted with it. It also works, although less impressively, with the Superior utility SPEECH!.

The SOUND EXPANSION came supplied with a User Guide, and a disc containing four demonstration programs and an adapted version of Superior's SPEECH! program.

The SOUND EXPANSION was originally available by mail order from Project Expansions for £89.99. A second hand SOUND EXPANSION will usually sell on eBay for £50-£70.

Front View [Connects to Acorn Plus 1]		Rear View