Jasper ZX Spectrum Emulator

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 BASIC 

 EDIT               F1
 CAPS LOCK          F2
 LEFT               F5,SHIFT+LEFT
 DOWN               F6,SHIFT+DOWN
 UP                 F7,SHIFT+UP
 RIGHT              F8,SHIFT+RIGHT

 GRAPHICS MODE      F9
 E MODE             TAB
 CAPS SHIFT         CONTROL
 SYMBOL SHIFT       ALT,META

 PAUSE/LOAD URL     ESC,HOME
 RESET SPECTRUM     END

Rainbow - by Richard Francis Altwasser.

Click on the screen to take control of the program.
Press BREAK and RUN 1700 for patterns.
If you like colourful BASIC (and who doesn't?) check out this Penny Vickers program from the Spectrum Manual - Flags of the World