7 Developer: Sinclair Research Manufacturer: Timex Corporation Released: 1981 Units sold: 1.5+ million CPU: 8-bit Zilog Z80 @ 3.25 MHz RAM: 1 KB (64 KB max. / 56 KB usable) Graphics: 24 lines x 32 characters or 64×48 pixels graphics mode Display: Monochrome on UHF television Media: External cassette recorder at 250 baud