By Rodnay Zaks
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Player l's right-most three LEDs (LEDs 13 through 15) are lit up: PLRl LOA#% 11110000 STAPORTlB The other LEDs on the Games Board are cleared: LOA #0 STA PORTIA A DELAY is then implemented, and we get ready to play another game, up to a total of 10: LOA #$40 JSR DELAY The score for player 1 is incremented: INC PLYRl 52 PSEUDO RANDOM NUMBER GENERATOR It is compared to 10. If it is less than 10, a return occurs to the main MOVE routine: LOA #10 CMP PLYRl BNEMOVE Otherwise, the maximum score of 10 has been reached and the game is over.
As before, the contents of the running nibble-pointer are shifted to the right and become a byte pointer. The corresponding table entry is then loaded using an indexed addressing method: 37 ADVANCED 6502 PROGRAMMING PLAYEM LOOP LDX#O STX PTR LDAPTR LSRA PTR =0 TAX ENDBYT LDATABEG,X BCSENDBYT AND #OJoOOOOl 111 BCCFINISH AND #OJo 11110000 LSRA LSRA LSRA LSRA Depending upon the value of the bit which has been shifted into the carry, either the high-order nibble or the low-order nibble will be extracted and left-justified in the accumulator.
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. OF WINS. ;SHOW RIGHT ARROW. to PORT1B CNTLO CNTHI PLAY CNTLO CNTlL CNTHI ; CLEAR COUNTERS. ;GET PLAYER 1 'S TIME. ; XFER TEMP COUNT TO PERMANENT STORAGE. Fig. 6: Translate Program 49 ADVANCED 6502 PROGRAMMING 0085 0086 0087 0088 0089 0090 0091 0092 0093 0094 0095 0096 0097 0098 0099 0100 0101 0102 0103 0104 0105 0106 0107 0108 0109 0110 0111 0112 0113 0114 0115 0116 0117 0118 0119 0120 0121 0122 0123 0124 0125 0126 0127 0128 0129 0130 0131 0132 0133 0134 0135 0136 0137 0138 0139 0140 0141 0142 0143 0144 0145 0146 0147 0148 0149 0150 0151 0152 0153 0154 0155 0156 0157 0158 0159 0160 0161 0162 0163 0164 0165 022B 022D 022F 0232 0234 0237 0239 023B 023D 0240 0242 0244 0246 0248 024A 024C 024C 024E 0250 0252 0254 0257 0259 025C 025E 0261 0263 0265 0267 0269 026B 026E 026F 0271 0274 0276 0279 027B 027E 0280 0282 0284 0286 0288 028B 028C 02BC 028C 028C 028C 028C 028C 028C 028F 0292 0295 85 A9 BD A9 BD A9 85 85 03 3C 01 AO 01 00 AO 00 02 01 20 02 ec AS 01 cs 03 FO 04 90 27 BO 08 AS 02 CS 90 BO A9 BD A9 BD A9 20 E6 A9 04 lF 00 FO 00 00 01 40 E3 05 OA cs 05 DO AB A9 FO 20 CB 60 A9 OE SD 00 A9 00 BD 01 A9 40 20 E3 E6 06 A9 OA cs 06 DO BE A9 OE 20 CB 60 EOUAL PLR1 AO STA LDA STA LDA STA LDA STA STA JSR LDA CHP BED BCC BCS LDA CHP BCC BCS LDA STA LilA AO 02 02 PLR2 AO AO 02 02 STA LDA JSR INC LDA CMP BNE LDA JSR RTS LDA STA LDA STA LDA JSR INC LDA CHP BNE LDA JSR RTS CNT1H nooo111100 ; SHOW LEFT ARROW.
