By Rodnay Zaks
Publication via Zaks, Rodnay
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THE PROGRAM The corresponding program uses only one significant data structure. It is called NUMTAB and is used to facilitate the display of the random binary numbers on the LEDs. Remember that LED #10 must always be lit (it is the "proceed" LED). LED #11 must always be off. LEDs 12, 13, 14, and 15 are used to display the binary number. Remember also that bit position 6 of Port 1B is not used. As a result, displaying a "O" will be accomplished by outputting the pattern 43 ADVANCED 6502 PROGRAMMING START LIGHT LEDs TO SHOW PLAYER 2 WINS ROUND SHOW THAT IT IS PLAYER 2's TURN END Fig.
When computing the corresponding frequencies of the higher or the 23 ADVANCED 6502 PROGRAMMING ACOO OPB AC02 DDRB Fig. 4: Memory Map lower octave, they are simply obtained by multiplying by two, or dividing by two, respectively. Generating the Tone The half-period delay for the square wave sent to the speaker is implemented using a program loop with a basic 10 µs cycle time. In the program, the "loop index," or iteration counter is used to count the number of 10 µs cycles executed. 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.
I;o: PORT1A PORTlB DDRlA DDRlB PORT3A PORT3B DDR3A DDR3B $A001 $AOOO tA003 $A002 $AC01 $ACOO $AC03 $AC02 ;LEDS 1-8 ;LEDS 9-15 ;KEY STROBE INPUT. ;KEY + OUTPUT. ; ;vARIABLE STORAGE! *= TEMP CNTHI $0 *=*+1 ; TEMPORARY STORAGE FOR AMT• OF *=*+1 ;TIME PL YR USES TO GUESS• CNTLO ;AMT. OF TIME PLYRl USES TO GUESS. CNT1H *=*+1 CNT1L *=*+1 ; SCORE OF + WON FOR PL YR 1. PLYRl *=*+1 ; PUnER 2 SCORE. PLYR2 ; STORES NUMBER TO BE GUESSED• NUMBER ; SCRATCHPAD ~OR RND • t GEN• SCR *=*+1 *=*+1 *=*+1 *=*+6 ' ITABLE OF 'REVERSED' NUMBERS FOR DISPLAY HN BITS 3-8 OF PORTlB, OR LEDS 12-15.
Advanced 6502 Programming by Rodnay Zaks