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Sinclair BASIC (taking its name from innovator Sir Clive Sinclair) is a dialect of the BASIC...

Sinclair BASIC (taking its name from innovator Sir Clive Sinclair) is a dialect of the BASIC programming language used in the 8-bit home computers from Sinclair Research and Timex Sinclair. The Sinclair BASIC interpreter was made by Nine Tiles Networks Ltd. Originally developed in 1979 to fit in the 4 kB ROM of the ZX80, it was initially an incomplete implementation of the 1978 ANSI minimal BASIC standard and evolved through the 8 kB ROM ZX81 and TS1000 to be an almost complete version in the 16 kB ROM ZX Spectrum. On the Spectrum there are 86 reserved words in Sinclair BASIC, denoting commands (of which there were 50), functions (31), and other keywords (5). They were entered with the ZX Spectrum's sometimes obscure context-based keyword entry system, whereby BEEP (for example), was keyed by pressing CAPS plus SYMBOL SHIFT, followed by SYMBOL SHIFT plus Z. More common commands were entered using a single keystroke, for example pressing P caused the entire command PRINT to appear. Commands found exclusively on the ZX81 and its clones, the TS1000 and TS1500 are: On the ZX Spectrum each reserved word was assigned a character code between 165 and 255 in the latter half of the system