ZX Spectrum

ZX Spectrum — one of the first home computers known among fans as Speccy. This eight-bit model was created by the English firm Sinclair Research LTD based on the Zilog Z80 processor. The device was provided on April 23, 1982 in two basic configurations - 16 and 48 Kb of RAM. The most part of programs for ZX Spectrum extended on audio cassettes. Spectrum was intended for work with the normal household cassette tape recorder. The first ZX Spectrum model had the original inexpensive keyboard in production consisting of 40 rubber keys. The multifunctionality was its characteristic feature: alphanumeric keys had up to seven values in the different modes. The only graphics mode of the computer was characteristic. Colors (8 flowers and two brightness levels, plus attribute of flicker) and actually graphics were kept in different sections of memory. At the same time, though graphic permission was 256×192 points, color attributes were set on character location. Each character location of 8×8 pixels in size could have only two colors (color of pixel and color of "background") attributed to it and on one attribute of brightness and flickers.