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By P. Hawthorne

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Extra info for A Science Teacher’s Companion to the BBC Microcomputer

Sample text

2290 PROCarrow flashes a left or right arrow for the specified number of times. 44 A Science Teacher's Companion to the BBC Microcomputer 2410 PROCpause is the usual delay with an added 'beep' as the delay expires. 2470 FNgetkey, see earlier programs. 2520 FNcont review allows student to continue to the next section or to review the preceding one. 2590 PROCion draws the ion paths within the velocity selector. 2700 FNmenu p~ints a list of options and obtains the student's choice. 2890 PROCtable lists atomic symbols, masses and mass numbers.

The loop variable ' t ' is the time 26 A Science Teacher's Companion to the BBC Microcomputer 390 400 410 430 460 470 480-640 of flight in seconds and SY% is the height fallen. X% and Y% are the shell's X,Y coordinates. Checks if the target has been hit. The function POINT(X%,Y%) reads the logical colour at the point with screen coordinates (X%,Y%). The target is printed in red (logical colour 1) so that, if the point where the bomb is about to be plotted is '1', then we have a hit and hence PROChit is called.

The loop variable ' t ' is the time 26 A Science Teacher's Companion to the BBC Microcomputer 390 400 410 430 460 470 480-640 of flight in seconds and SY% is the height fallen. X% and Y% are the shell's X,Y coordinates. Checks if the target has been hit. The function POINT(X%,Y%) reads the logical colour at the point with screen coordinates (X%,Y%). The target is printed in red (logical colour 1) so that, if the point where the bomb is about to be plotted is '1', then we have a hit and hence PROChit is called.

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