Read e-book online Advanced 6502 Programming PDF

By Rodnay Zaks

ISBN-10: 089588089X

ISBN-13: 9780895880895

E-book by way of Zaks, Rodnay

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Play the tune on keys "O" through "D" (using the notes and the rest features). Up to 254 notes may be played and stored in the memory. At any point, the playback key ("E") may be pressed and the notes and rests that were just played on the keyboard (and simultaneously stored in the memory) will be reproduced. 2. THE CONNECTIONS This game uses the keyboard plus the speaker. The speaker is connected in series to one of the buffered output lines of PORT B of VIA #3, via a 1f 0-ohm current limiting resistor.

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.

NXTST CMP #15 BNE NXTST JSR BEEP3 BCC START CMP #14 BNE NUMKEY JSR PLAYEM CLC BCC NXKEY Exercise 2-3: Why are the last two instructions in this routine used instead of an unconditional jump? What are the advantages and disadvantages of this technique? Every time key number 15 is pressed, a special three-tone routine called BEEP3 is played. The BEEP3 routine is shown at address 0287. It plays three notes in rapid succession to indicate to the user that the notes in the memory have been erased. The erasure is performed by resetting the list length PILEN to zero.

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Advanced 6502 Programming by Rodnay Zaks


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