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50 PRINT Acorn Computer Ltd Acornsoft action allows array ASCII codes BASIC BBC machine BBC Micro BBC Microcomputer brackets BREAK key CAPS LOCK carried cassette recorder code number command Count DATA list DATA pointer DELETE display effect ENDPROC Fig EPROM error message ESCAPE key example Figure filename followed foreground colour GCOL GOTO graphics characters illustrated INKEY INPUT inverted commas jack plug keyboard letters line 20 line number look loop means memory method MODE mugtrap normal number of characters number variable operating system piece of program pixels plug press RETURN press the RETURN printer procedure program in Fig radians renumber REPEAT RETURN key selected shape simple socket space starts statement stop stored string variable subroutine switched symbols tape Teletext TV receiver variable name VDU instruction Video Genie volume control words zero