New PDF release: Advanced 6502 Programming

By Rodnay Zaks

ISBN-10: 089588089X

ISBN-13: 9780895880895

Booklet via Zaks, Rodnay

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Extra resources for Advanced 6502 Programming

Example text

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. ;ENDGAME: RETURN TO MONITOR. ;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.

AFTER ;BOTH PLAYERS TAKE TURNS, RESULTS ARE ;SHOWN ON BOTTOM ROW+ AFTER 10 WINS, ;A PLAYER'S RESULTS WILL FLASH, ;SHOWING THE BETTER PLAYER. THEN ;THE GAME RESTARTS. ; ;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.

If the comparison succeeds, exit occurs. Otherwise, all LEDs are cleared using an AND, to prevent changing the status of LED 9, and the subroutine is reentered. Note that the remaining time for the player will be decremented every time the CNTSUB subroutine is called. It will eventually decrement to 0, and this player will be given another number to guess: 54 PSEUDO RANDOM NUMBER GENERATOR DONE CPY NUMBER BEQ DONE LDA #01 AND PORTlB STA PORTlB JMP PLAY RTS Correct guess? No: clear old guess Try again Exercise 3-1: Modify PLAY and/or CNTSUB so that, upon timeout, the player loses the current round, as if the maximum amount of time had been taken to make the guess.

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Advanced 6502 Programming by Rodnay Zaks


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