High Quality Content by WIKIPEDIA articles! The Sinclair ZX Printer is a spark printer which was produced by Sinclair Research for its ZX81 home computer. It was launched in 1981, with a recommended retail price of 49.95. The ZX Printer used special 4-inch (100 mm) wide black paper which was supplied coated with aluminium oxide, this was electrically marked during the printing process to reveal its black under-surface. The printer's horizontal resolution was the same as the ZX81's video display, ie. 256 dots (pixels) or 32 characters (using the standard character definition). The print quality was crude, but no other printer was compatible with the ZX81 without the use of additional software and interface hardware.

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