By Rodnay Zaks
Booklet by means of Zaks, Rodnay
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LIGHT LEFT SIDE OF BOTTOM. B tO ; CLEAR LOW LEDS. PORTIA HJAIT A WHILE TO SHOW WIN. O PLYR2 ;JF NOT, PLAY ANOTHER ROUND. HOVE ;YES-GET PATTERN TO BLINK LEDS. U1110 BLINK ;BLINK THEM ;END. ;suBROUTINE 'PLAY' ;GETS TIME COUNT OF EACH PLAYER, AND IF ;BAD GUESSES ARE MADE, THE PLAYER IS ;GIVEN ANOTHER CHANCE, THE NEW TIME ADDED TO ;THE OLD. B PLAY ; GET RANDOM NUMBER. ;RANDOM - LENGTH DELAY• ; GET ANOTHER. ;KEEP UNDER 16 FOR USE AS ;NUMBER TO GUESS. • •• ; •• GET REVERSED PATTERN FROM TABLE • • • ; ••• TO DISPLAY IN LEDS 12-lS.
Within the tune table, two "nibble" -pointers are used: PILEN during input and PTR during output. ) In order to obtain the actual table entry from the nibble-pointer, the pointer is simply shifted one bit position to the right. The remaining value becomes a byte-pointer, while the bit shifted into the carry flag specifies the left or the right half of the byte. The two tables called CONSTANTS and NOTE DURATIONS are simply reference tables used to determine the half-frequency of a note and the number of times the speaker should be triggered once a note has been identified or specified.
The corresponding routine appears below: 34 GENERATING SQUARE WAVES BEEP3 LDA #$FF STA DUR LDA #$4B JSR TONE LDA #$38 JSR TONE LDA #$4B JSR TONE CLC RTS Beep duration constant Code forE2 1st note CodeforD2 2nd note Code forE2 3rd note Its operation is straightforward. The NUMKEY routine will save the code corresponding to the note in the memory. As in the case of a Teletype program, the computer will echo the character which has been pressed in the form of an audible sound. In other words, every time a key has been pressed, the program will play the corresponding note.
Advanced 6502 Programming by Rodnay Zaks