apple-pascal-1.3-manual

Game InputApple Pascal provides the function PADDLE to read inputs from theApple II GAME connector. It is written with one parameter:PADDLE (SELECT)where SELECT MOD 4 is an integer expression with a value of 0, 1, 2, or 3,representing the four hand control inputs on the GAME connector. PADDLEreturns an integer in the range 0 .. 255, representing the position of theselected hand control.Apple Key and Button InputsThe function BUTTON reads the 6 and • keys; it also reads the 0 and 1buttons on the Apple hand controls. It is written with one parameter:BUTTON (SELECT)where SELECT is an integer expression with a value of 0 to represent the 6key (or hand control button 0), or 1 to represent the ~ key (or hand controlbutton 1). BUTTON returns a boolean value; TRUE while the key or buttonis pressed, FALSE otherwise.The Audio OutputApple Pascal provides one procedure for creating clicks or musical toneswith the built-in speaker. The NOTE procedure is writtenNOTE (PITCH, DURATION)where PITCH is an integer expression with a value in the range 0 .. 50 andDURATION is an integer expression with a value in the range 0 .. 255. APITCH of 0 is silent; PITCH values of 2 through 48 produce anapproximately tempered chromatic scale with sharps and flats. DURATIONvalues represent arbitrary (but equal) time units during which the note issounded.NOTE (1,1) produces a single click.The following statement, for example, produces a chromatic octave:FOR N := 12 TO 24 DO NOTE CN, 10fD;Miscellaneous 1/0 InformationIll-269