Download e-book for iPad: Advanced 6502 Programming by Rodnay Zaks

By Rodnay Zaks

ISBN-10: 089588089X

ISBN-13: 9780895880895

Booklet by way of Zaks, Rodnay

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This will be the binary number displayed on the LEDs. It is stored at location NUMBER: JSR RANDOM AND#OF STA NUMBER Mask off high nibble The NUMTAB table, described at the beginning of this section, is then accessed to obtain the correct pattern for lighting the LEDs using indexed addressing. Register X contains the number between O and 15 to be displayed: UseXasindex TAX LDA NUMTAB,X Retrieve pattern The pattern in the accumulator is then stored in the output register in order to light the LEDs.

It monitors a player's keystroke and records the amount of time elapsed until the key is pressed. The key scanning is performed in the usual way: CNTSUB KEYLP FINISH LDY #$F STY PORT3B BIT PORT3A BPL FINISH DEY BPL KEYLP BNE CNTSUB Count down key # Next key Each time that all keys have been scanned unsuccessfully, the time elapsed counter is incremented (CNTLO,CNTHI): FINISH INC CNTLO BNE CNTSUB INC CNTHI BNE CNTSUB RTS Upon return of the subroutine, the number corresponding to the key which has been pressed is contained in index register Y.

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. 10111010 ;MAIN PROGRAM ; A9 SD SD SD A9 SD 85 85 A9 80 A9 SD 85 85 20 A5 85 A5 FF 03 02 02 00 03 05 06 79 01 00 00 02 01 BC 02 04 01 START AO AO AC AC MOVE AO AO 02 *= $200 LOA STA STA STA LDA STA STA STA LDA STA LDA STA STA STA JSR LDA STA LIIA OFF DDR1A DDRlB DDR3B ; SET UP PORTS to DDR3A PLYRl PLYR2 1%01111001 PORT1A ;CLEAR NO.

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Advanced 6502 Programming by Rodnay Zaks


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