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Apple Computers Apple Macintosh automatically binary code binary digits binary number British Telecom calculators and digital Capacitors Casio Electronics central computer characters chemical vapours colours components computer control computer language computer memory computer users databases decimal number device digital computer digital watches diodes disk drive display unit doping electric electronic circuits electronic equipment electronic typewriter floppy disks flowchart functions graphics hardware home computer human information and instructions input instructions fed instructions that tells integrated circuit keyboard layer letters light linked liquid crystal display magnetic disks mainframe computer masking microchip microcomputers microdrive modem mouse number system ordinary output pixels plotter pocket calculator Prestel printed circuit board produce program to draw Resistors screen set of instructions silicon chip Sinclair Research square switches Telecom Technology Showcase TeleFocus/British Telecom telephone lines transistors TV sets viewdata word processor X-ray scanner