By Rodnay Zaks
Publication by means of Zaks, Rodnay
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Extra info for Advanced 6502 Programming
Finally, common utility routines are TONE and PLAYIT. Let us examine these routines in greater detail. The program resides at memory addresses 200 and up. Note that the program, like most others in this book, assumes the availability of the GETKEY routine described in Chapter 1. The operation of the NXKEY routine is straightforward. The next key closure is obtained by calling the GETKEY routine: START NXKEY LDA #0 STA PILEN CLC JSR GETKEY Initialize length of list to 0 The value read is then compared to the constants "15" and "14" for special action.
30 Fig. 5: Frequencies for the Middle C Octave On the last iteration of the loop (when the loop index is decremented to zero), the branch instruction at the end will fail. This branch instruction will execute faster, so that one microsecond (assuming a 1 MHz clock) must be subtracted from the total delay duration. The tone generation routine is shown below: TONE FL2 FLl STA LDA STA LDA LDX LDY DEY CLC BCC BNE EOR STA DEX BNE RTS FREQ #$FF DDRB #$00 DUR F~:QJ FLl #$FF OPB INNER LOOP OUTER LOOP FL2 Note the "classic" nested loop design.
COMPARE TO PLAYER 1 'S. ;CHECK LOW ORDER BYTES TO RESOLVE WINNER, ;PLAYER 2 HAS SMALLER COUNT, SHOW IT• ;PLAYER 1 HAS SMALLER COUNT, SHOW IT, ;HI BYTES WERE EQUAL, SO ;CHECK LOW BYTES. ; COMPARE SCORES. L ;PLAYER 2 WINS, SHOW IT, PLR2 ;PLAYER 1 WINS, SHOW IT, PLR! ;LIGHT RIGHT SIDE OF BOTTOM ROW tX!! 110000 ;TO SHOW WIN. PORT1B to ; CLEAR LOW LEDS. PORTIA ; WAIT A WHILE TO SHOW WIN. HAS HE WOM 10~ PLYR1 ; IF NOT, PLAY ANOTHER ROUND. MOVE tX11110000 HES - GET BLINK PATTERN. BLINK ;BLINK WINNING SIDE.
Advanced 6502 Programming by Rodnay Zaks