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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. The subroutine PLAYIT described below is used to obtain the appropriate constants and to play the note: FINISH JSR PLAY IT Play note A delay is then implemented between two consecutive notes, the running pointer is incremented, a check occurs for a possible end of list, and the loop is reentered: LDX #$20 JSR DELAY INC PTR LDA PTR CMP PILEN BCC LOOP RTS Delay constant Delay between notes One nibble used Check for end of list No: get next note Done PLAYIT Subroutine The PLAYIT subroutine plays the note or implements a rest, as specified by the nibble passed to it in the accumulator.
0226: 0229: 022B: 022c: 85 20 AS C9 DO 20 90 4A AB 01 70 02 00 FF 05 87 02 DA 022D: AS 01 022F! BO 09 0231 0233 0236 0238 023A 023B 023C 023D 023E 0241 0244 0246 29 99 E6 90 OA OA OA OA 19 99 E6 90 OF 00 03 00 CB 00 03 00 03 00 BD NUMKEY STA JSR LDA CHP BNE JSR BCC OK LSR TAY LDA BCS AND STA INC BCC FINBYT ASL. 00001111 11ST NIBBLE, MASK HIGH NIBBLE TABEG,Y ISAVE UNFINISHED 1/2 BYTE IPOINT TO NEXT NIBBLE PI LEN NXKEY IGET NEXT KEYSTROKE A ;SHIFT NIBBLE 2 TO HIGH ORDER A A A IJOIN 2 NIBBLES AS BYTE TABEG,Y ;,,,AND STORE, TABEG,Y PILEN ;POINT TO NEXT NIBBLE IN NEXT BYTE NXKEY IRETURN TEMP PLAY IT PI LEN HFF OK BEEP3 NXKEY A Fig.
The remaining value becomes a byte-pointer, while the bit shifted into the carry flag specifies the left or the right half of the byte. The two tables called CONSTANTS and NOTE DURATIONS are simply reference tables used to determine the half-frequency of a note and the number of times the speaker should be triggered once a note has been identified or specified. Both of these tables are accessed indirectly using the X register. Some Music Theory A brief survey of general music conventions is in order before describing the actual program.