Acorn also produced a dedicated disc expansion, the Plus 3, featuring a disc controller and 3.5-inch floppy drive. Acorn introduced a general-purpose expansion unit, the Plus 1, offering analogue joystick and parallel ports, together with cartridge slots into which ROM cartridges, providing software, or other kinds of hardware expansions, such as disc interfaces, could be inserted. Several expansions were made available to provide many of the capabilities omitted from the BBC Micro. It was capable of bitmapped graphics, and could use either a television set, a colour ( RGB) monitor or a monochrome monitor as its display. The Electron was able to save and load programs onto audio cassette via a supplied cable that connected it to any standard tape recorder that had the correct sockets. Announced in 1982 for a possible release the same year, it was eventually introduced on 25 August 1983 priced at £199. It had 32 kilobytes of RAM, and its ROM included BBC BASIC II together with the operating system. The Acorn Electron (nicknamed the Elk inside Acorn and beyond ) was a lower-cost alternative to the BBC Micro educational/ home computer, also developed by Acorn Computers Ltd, to provide many of the features of that more expensive machine at a price more competitive with that of the ZX Spectrum. RF modulator, composite video, RGB monitor outputġ60×256 (4 or 16 colours), 320×256 (2 or 4 colours), 640×256 (2 colours), 320×200 (2 colours – spaced display with two blank horizontal lines following every 8 pixel lines), 640×200 (2 colours – spaced display) Synertek SY6502A clocked at 2 MHz when accessing ROM and 1 MHz when accessing RAM Cassette tape, floppy disk (optional), ROM cartridge (optional)
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