7 Developer: BBC Manufacturer: Acorn Computers Released: 1981 OS: Acorn MOS Units sold: 1.5 million CPU: 8-bit MOS Technology 6502/6512 @ 2 MHz RAM: 16 to 128 KB depending on model Graphics: 640×256 pixels, 8 colours Sound: TI SN76489, 4 channels + TMS5220 speech synthesiser Media: Cassette, floppy disk