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By Rodnay Zaks

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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.

Both parts of the program use the PLAYNOTE subroutine which looks up the note and duration constants, and plays the note. 8. TEMPORARY STORAGE FOR FREQUENCY ITEMP STORAGE FOR DURATION ;TABLE TO STORE MUSIC IVIA OUTPUT PORT B IVIA PORT B DIRECTION REGISTER I ORIGIN ICOMHAND LINE INTERPRETER SF AS INPUT MEANS RESET POINTERS, START OVER, SE MEANS PLAY CURRENTLY STORED NOTES ANYTHING ELSE IS STORED FOR REPLAY, 0200 0202 0204 0205 0208 020A 020C 020F 0211 0213 0215 0218 0219 A9 85 18 20 C9 DO 20 90 C9 DO 20 18 90 00 00 START 00 01 OF 05 87 02 EF OE 06 48 02 NXKEY NXTST EA LDA STA CLC JSR CMP BNE JSR BCC CMP BNE JSR CLC BCC to PI LEN ;CLEAR NOTE LIST LENGTH I CLEAR NIBBLE MARKER GET KEY NXTST BEEP3 START +14 NUMKEY PLAYEM ;IS KEY 115" INO, DO NEXT TEST ITELL USER OF CLEARING ICLEAR POINTERS AND START OVER ; IS KEY +141' ;No, KEY IS NOTE NUMBER ;PLAY NOTES NXKEY IGET NEXT COMMAND :115 IROUTINE TO LOAD NOTE LIST WITH NOTES ; 021B: 021D: 0220: 0222!

The PTR memory location is used as the running nibble-pointer for the note table. 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.

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