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In page Acorn Electron:
"Since the Electron provides only a selection of video output ports, a cassette port and the expansion connector, a range of additional expansions were produced to offer ports and connections to various peripherals. The first expansions were largely joystick and printer interfaces or sideways ROM boards.[1] For instance, First Byte Computers developed an interface and software which allowed a "switched" joystick to be used with the majority of software titles.[2] This interface became very popular and was sold by W.H. Smiths, Boots, Comet and hundreds of independent computer dealers,[citation needed] selling as many as 23,000 units over a two-year period, helped by a bundling agreement with Dixons.[3]
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