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226 lines
15 KiB
Plaintext
226 lines
15 KiB
Plaintext
0000- 4 ;
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0000- 5 ; MUSIC PLAYER FOR THE BE6502 USING '6502 GAMES' HARDWARE. BOARD SHOULD BE
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0000- 6 ; JUMPERED WITH VIA CHIPS AT THE ADDRESSES SPECIFIED BELOW. OTHER THAN THAT
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0000- 7 ; THE CODE IS UNCHANGED FROM THE BOOK.
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0000- 8 ;
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4000- 9 VIA1 .EQ $4000 ; GAME BOARD (VIA #1)
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4C00- 10 VIA3 .EQ $4C00 ; GAME BOARD (VIA #3)
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0000- 11
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8000- 12 .OR $8000
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8000- 13 .TA $0000
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8000-20 06 81 14 ( 6) BE6502 JSR INITKEY
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8003- 15 .IN ../../common/CH02-Music/player.asm
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8003- I 1 ; MUSIC PLAYER PROGRAM
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8003- I 2 ; USES 16-KEY KEYBOARD AND BUFFERED SPEAKER
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8003- I 3 ; PROGRAM PLAYS STORED MUSICAL NOTES. THERE ARE TWO MODES OF OPERATION: INPUT
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8003- I 4 ; AND PLAY. INPUT MODE IS THE DEFAULT, AND ALL NON-COMMAND KEYS PRESSED PRESSED
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8003- I 5 ; (0-D) ARE STORED FOR REPLAY. IF AN OVERFLOW OCCURS, THE USER IS WARNED WITH
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8003- I 6 ; A THREE-TONE WARNING. THE SAME WARBLING TONE IS ALSO USED TO SIGNAL A RESTART
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8003- I 7 ; OF THE PROGRAM.
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8003- I 8 ;
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0000- I 9 PILEN .EQ $00 ; LENGTH OF NOTE LIST
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0001- I 10 TEMP .EQ $01 ; TEMPORARY STORAGE
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0002- I 11 PTR .EQ $02 ; CURRENT LOCATION IN LIST
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0003- I 12 FREQ .EQ $03 ; TEMPORARY STORAGE FOR FREQUENCY
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0004- I 13 DUR .EQ $04 ; TEMP STORAGE FOR DURATION
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0300- I 14 TABEG .EQ $0300 ; TABLE TO STORE MUSIC
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4C00- I 15 PORT3B .EQ VIA3 ; VIA OUTPUT PORT B
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4C02- I 16 DDR3B .EQ VIA3+2 ; VIA PORT B DIRECTION REGISTER
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4C03- I 17 DDR3A .EQ VIA3+3
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4C01- I 18 PORT3A .EQ VIA3+1
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4C00- I 19 PORT3B .EQ VIA3
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8003- I 20
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8003- I 21 ;
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8003- I 22 ; COMMAND LINE INTERPRETER
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8003- I 23 ; $F AS INPUT MEANS RESET POINTERS, START OVER.
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8003- I 24 ; $E MEANS PLAY CURRENTLY STORED NOTES
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8003- I 25 ; ANYTHING ELSE IS STORED FOR REPLAY.
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8003- I 26 ;
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8003-A9 00 I 27 ( 2) START LDA #0 ; CLEAR NOTE LIST LENGTH
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8005-85 00 I 28 ( 3) STA PILEN
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8007-18 I 29 ( 2) CLC ; CLEAR NIBBLE MARKER
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8008-20 E1 80 I 30 ( 6) NXKEY JSR GETKEY
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800B-C9 0F I 31 ( 2) CMP #15 ; IS KEY #15?
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800D-D0 05 I 32 (2**) BNE NXTST ; NO, DO NEXT TEST
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800F-20 8A 80 I 33 ( 6) JSR BEEP3 ; TELL USER OF CLEARING
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8012-90 EF I 34 (2**) BCC START ; CLEAR POINTERS AND START OVER
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8014-C9 0E I 35 ( 2) NXTST CMP #14 ; IS KEY #14?
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8016-D0 06 I 36 (2**) BNE NUMKEY ; NO, KEY IS NOTE NUMBER
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8018-20 4B 80 I 37 ( 6) JSR PLAYEM ; PLAY NOTES
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801B-18 I 38 ( 2) CLC
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801C-90 EA I 39 (2**) BCC NXKEY ; GET NEXT COMMAND
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801E- I 40 ;
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801E- I 41 ; ROUTINE TO LOAD NOT LIST WITH NOTES
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801E- I 42 ;
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801E-85 01 I 43 ( 3) NUMKEY STA TEMP ; SAVE KEY, FREE A
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8020-20 73 80 I 44 ( 6) JSR PLAYIT ; PLAY NOTE
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8023-A5 00 I 45 ( 3) LDA PILEN ; GET LIST LENGTH
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8025-C9 FF I 46 ( 2) CMP #$FF ; OVERFLOW?
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8027-D0 05 I 47 (2**) BNE OK ; NO, ADD NOTE TO LIST
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8029-20 8A 80 I 48 ( 6) JSR BEEP3 ; YES, WARN USER
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802C-90 DA I 49 (2**) BCC NXKEY ; RETURN TO INPUT MODE
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802E-4A I 50 ( 2) OK LSR A ; SHIFT LOW BIT INTO NIBBLE POINTER
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802F-A8 I 51 ( 2) TAY ; USE SHIFTED NIBBLE POINTER AS BYTE INDEX
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8030-A5 01 I 52 ( 3) LDA TEMP ; RESTORE KEY#
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8032-B0 09 I 53 (2**) BCS FINBYT ; IF BYTE ALREADY HAS A NIBBLE, FINISH IT AND STORE
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8034-29 0F I 54 ( 2) AND #%00001111 ; 1ST NIBBLE. MASK HIGH NIBBLE
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8036-99 00 03 I 55 ( 5) STA TABEG,Y ; SAVE UNFINISHED 1/2 BYTE
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8039-E6 00 I 56 ( 5) INC PILEN ; POINT TO NEXT NIBBLE
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803B-90 CB I 57 (2**) BCC NXKEY ; GET NEXT KEYSTROKE
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803D-0A I 58 ( 2) FINBYT ASL A ; SHIFT NIBBLE 2 TO HIGH ORDER
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803E-0A I 59 ( 2) ASL A
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803F-0A I 60 ( 2) ASL A
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8040-0A I 61 ( 2) ASL A
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8041-19 00 03 I 62 ( 4*) ORA TABEG,Y ; JOIN 2 NIBBLES AS BYTE
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8044-99 00 03 I 63 ( 5) STA TABEG,Y ; ... AND STORE.
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8047-E6 00 I 64 ( 5) INC PILEN ; POINT TO NEXT NIBBLE IN NEXT BYTE
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8049-90 BD I 65 (2**) BCC NXKEY ; RETURN
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804B- I 66 ;
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804B- I 67 ; ROUTINE TO PLAY NOTES
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804B- I 68 ;
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804B-A2 00 I 69 ( 2) PLAYEM LDX #0 ; CLEAR POINTER
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804D-86 02 I 70 ( 3) STX PTR
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804F-A5 02 I 71 ( 3) LDA PTR ; LOAD ACCUMULATOR WITH CURRENT POINTER VALUE
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8051-4A I 72 ( 2) LOOP LSR A ; SHIFT NIBBLE INDICATOR INTO CARRY
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8052-AA I 73 ( 2) TAX ; USE SHIFTED NIBBLE POINTER AS BYTE POINTER
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8053-BD 00 03 I 74 ( 4*) LDA TABEG,X ; LOAD NOTE TO PLAY
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8056-B0 04 I 75 (2**) BCS ENDBYT ; LOW NIBBLE USED, GET HIGH
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8058-29 0F I 76 ( 2) AND #%00001111 ; MASK OUT HIGH BITS
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805A-90 06 I 77 (2**) BCC FINISH ; PLAY NOTE
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805C-29 F0 I 78 ( 2) ENDBYT AND #%11110000 ; THROW AWAY LOW NIBBLE
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805E-4A I 79 ( 2) LSR A ; SHIFT INTO LOW
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805F-4A I 80 ( 2) LSR A
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8060-4A I 81 ( 2) LSR A
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8061-4A I 82 ( 2) LSR A
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8062-20 73 80 I 83 ( 6) FINISH JSR PLAYIT ; CALCULATE CONSTANTS & PLAY
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8065-A2 20 I 84 ( 2) LDX #$20 ; BETWEEN-NOTE DELAY
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8067-20 9F 80 I 85 ( 6) JSR DELAY
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806A-E6 02 I 86 ( 5) INC PTR ; ONE NIBBLE USED
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806C-A5 02 I 87 ( 3) LDA PTR
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806E-C5 00 I 88 ( 3) CMP PILEN ; END OF LIST?
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8070-90 DF I 89 (2**) BCC LOOP ; NO, GET NEXT NOTE
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8072-60 I 90 ( 6) RTS ; DONE
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8073- I 91 ;
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8073- I 92 ; ROUTINE TO DO TABLE LOOK UP, SEPARATE REST
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8073- I 93 ;
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8073-C9 0D I 94 ( 2) PLAYIT CMP #13 ; REST?
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8075-D0 06 I 95 (2**) BNE SOUND ; NO.
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8077-A2 54 I 96 ( 2) LDX #$54 ; DELAY = NOTE LENGTH = .21SEC
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8079-20 9F 80 I 97 ( 6) JSR DELAY
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807C-60 I 98 ( 6) RTS
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807D-AA I 99 ( 2) SOUND TAX ; USE KEYS AS INDEX..
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807E-BD D4 80 I 100 ( 4*) LDA DURTAB,X ; ... TO FIND DURATION.
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8081-85 04 I 101 ( 3) STA DUR ; STORE DURATION FOR USE
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8083-BD C7 80 I 102 ( 4*) LDA NOTAB,X ; LOAD NOTE VALUE
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8086-20 AB 80 I 103 ( 6) JSR TONE
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8089-60 I 104 ( 6) RTS
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808A- I 105 ;
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808A- I 106 ; ROUTINE TO MAKE 3 TONE SIGNAL
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808A- I 107 ;
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808A-A9 FF I 108 ( 2) BEEP3 LDA #$FF ; DURATION FOR BEEPS
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808C-85 04 I 109 ( 3) STA DUR
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808E-A9 4B I 110 ( 2) LDA #$4B ; CODE FOR E2
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8090-20 AB 80 I 111 ( 6) JSR TONE ; 1ST NOTE
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8093-A9 38 I 112 ( 2) LDA #$38 ; CODE FOR D2
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8095-20 AB 80 I 113 ( 6) JSR TONE
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8098-A9 4B I 114 ( 2) LDA #$4B
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809A-20 AB 80 I 115 ( 6) JSR TONE
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809D-18 I 116 ( 2) CLC
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809E-60 I 117 ( 6) RTS
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809F- I 118 ;
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809F- I 119 ; VARIABLE-LENGTH DELAY
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809F- I 120 ;
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809F-A0 FF I 121 ( 2) DELAY LDY #$FF
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80A1-EA I 122 ( 2) DLY NOP
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80A2-D0 00 I 123 (2**) BNE DL0 ; (.+2 IN BOOK)
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80A4-88 I 124 ( 2) DL0 DEY
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80A5-D0 FA I 125 (2**) BNE DLY ; 10 US. LOOP
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80A7-CA I 126 ( 2) DEX
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80A8-D0 F5 I 127 (2**) BNE DELAY ; LOOP TIME = 2556*[X]
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80AA-60 I 128 ( 6) RTS
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80AB- I 129 ;
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80AB- I 130 ; ROUTINE TO MAKE TONE: # OF 1/2 CYCLES IS IN 'DUR', AND 1/2 CYCLE TIME IS IN
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80AB- I 131 ; ACCUMULATOR. LOOP TIME = 20*[A]+26 US SINCE TWO RUNS THROUGH THE OUTER LOOP
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80AB- I 132 ; MAKES ONE CYCLE OF THE TONE.
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80AB- I 133 ;
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80AB-85 03 I 134 ( 3) TONE STA FREQ ; FREQ IS TEMP FOR # OF CYCLES
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80AD-A9 FF I 135 ( 2) LDA #$FF ; SET UP DATA DIRECTION REGISTER
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80AF-8D 02 4C I 136 ( 4) STA DDR3B
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80B2-A9 00 I 137 ( 2) LDA #$00 ; A IS SENT TO PORT, START HI
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80B4-A6 04 I 138 ( 3) LDX DUR
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80B6-A4 03 I 139 ( 3) FL2 LDY FREQ
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80B8-88 I 140 ( 2) FL1 DEY
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80B9-18 I 141 ( 2) CLC
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80BA-90 00 I 142 (2**) BCC FL0 ; (.+2 IN BOOK)
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80BC-D0 FA I 143 (2**) FL0 BNE FL1 ; INNER, 10 US LOOP.
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80BE-49 FF I 144 ( 2) EOR #$FF ; COMPLEMENT I/O PORT
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80C0-8D 00 4C I 145 ( 4) STA PORT3B ; ... AND SET IT
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80C3-CA I 146 ( 2) DEX
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80C4-D0 F0 I 147 (2**) BNE FL2 ; OUTER LOOP
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80C6-60 I 148 ( 6) RTS
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80C7- I 149 ;
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80C7- I 150 ; TABLE OF NOTE CONSTANTS
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80C7- I 151 ; CONTAINS:
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80C7- I 152 ; [OCTAVE BELOW MIDDLE C] : G,A,BCC
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80C7- I 153 ; [OCTAVE OF MIDDLE C] : C,D,E,F,F#,G,G#,A,B
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80C7- I 154 ; [OCTAVE ABOVE MIDDLE C] : C
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80C7- I 155 ;
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80C7-FE E2 C9 BE
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A9 96 8E 86
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7E 77 70 64
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5E I 156 NOTAB .HS FE.E2.C9.BE.A9.96.8E.86.7E.77.70.64.5E
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80D4- I 157 ;
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80D4- I 158 ; TABLE OF NOTE DURATIONS IN # OF 1/2 CYCLES SET FOR A NOTE LENGTH OF
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80D4- I 159 ; ABOUT .21 SEC.
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80D4- I 160 ;
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80D4-55 60 6B 72
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80 8F 94 A1
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AA B5 BF D7
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E4 I 161 DURTAB .HS 55.60.6B.72.80.8F.94.A1.AA.B5.BF.D7.E4
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80E1- 16 .IN ../../common/CH01-Getkey/getkey_routine.asm
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80E1- I 1 ; 'GETKEY' KEYBOARD INPUT ROUTINE READS AND DEBOUNCES KEYBOARD. RETURNS WITH
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80E1- I 2 ; KEY NUMBER IN ACCUMULATOR IF KEY DOWN. OPERATION: SENDS NUMBERS 0-F TO 74154
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80E1- I 3 ; (4 TO 16 LINE DECODER), WHICH GROUNDS ONE SIDE OF KEYSWITCHES ONE AT A TIME.
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80E1- I 4 ; IF A KEY IS DOWN, PA7 OF VIA #3 WILL BE GROUNDED, AND THE CURRENT VALUE
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80E1- I 5 ; APPLIED TO THE 74154 BE THE KEY NUMBER. WHEN THE PROGRAM DETECTS A KEY CLOSE
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80E1- I 6 ; CHECKS FOR KEY CLOSURE FOR 50 MS. TO ELIMINATE BOUNCE.
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80E1- I 7 ; NOTE: IF NO KEY IS PRESSED, GETKEY WILL WAIT.
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80E1- I 8 ;
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80E1-2C 01 4C I 9 ( 4) GETKEY BIT PORT3A ; SEE IF KEY IS STILL DOWN FROM LAST KEY CLOSURE:
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80E4- I 10 ; KEYSTROBE IN 'N' STATUS BIT.
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80E4-10 FB I 11 (2**) BPL GETKEY ; IF YES, WAIT FOR KEY RELEASE
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80E6-A2 0F I 12 ( 2) RSTART LDX #15 ; SET KEY COUNTER TO 15
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80E8-8E 00 4C I 13 ( 4) NXTKEY STX PORT3B ; OUTPUT KEY # TO 74154
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80EB-2C 01 4C I 14 ( 4) BIT PORT3A ; SEE IF KEY DOWN: STROBE IN 'N'
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80EE-10 05 I 15 (2**) BPL BOUNCE ; IF YES, GO DEBOUNCE
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80F0-CA I 16 ( 2) DEX ; DECREMENT KEY #
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80F1-10 F5 I 17 (2**) BPL NXTKEY ; NO, DO NEXT KEY
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80F3-30 F1 I 18 (2**) BMI RSTART ; START OVER
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80F5-8A I 19 ( 2) BOUNCE TXA ; SAVE KEY NUMBER IN A
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80F6-A0 12 I 20 ( 2) LDY #$12 ; OUTER LOOP CNT LOAD FOR DELAY OF 50 MS.
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80F8-A2 FF I 21 ( 2) LP1 LDX #$FF ; INNER 11 US. LOOP
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80FA-2C 01 4C I 22 ( 4) LP2 BIT PORT3A ; SEE IF KEY STILL DOWN
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80FD-30 E7 I 23 (2**) BMI RSTART ; IF NOT, KEY NOT VALID, RESTART
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80FF-CA I 24 ( 2) DEX
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8100-D0 F8 I 25 (2**) BNE LP2 ; THIS LOOP USES 2115*5 US.
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8102-88 I 26 ( 2) DEY
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8103-D0 F3 I 27 (2**) BNE LP1 ; OUTER LOOP: TOTAL IS 50 MS.
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8105-60 I 28 ( 6) RTS ; DONE: KEY IN A.
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8106- I 29 ;
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8106- I 30 ; SUBROUTINE 'INITKEY'
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8106- I 31 ; TAKES CARE OF INITIALIZING VIA #3 FOR USING WITH THE GETKEY ROUTINE FROM
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8106- I 32 ; THE CODE.
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8106- I 33 ;
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8106-A9 00 I 34 ( 2) INITKEY LDA #0
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8108-8D 03 4C I 35 ( 4) STA DDR3A ; SET KEY STROBE PORT FOR INPUT
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810B-A9 FF I 36 ( 2) LDA #$FF
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810D-8D 02 4C I 37 ( 4) STA DDR3B ; SET KEYS FOR OUTPUT
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8110-60 I 38 ( 6) RTS
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8111- 17 ;
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8111- 18 ; STORE CPU INITIALIZATION VECTORS AT THE END OF THE EEPROM.
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8111- 19 ;
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FFFA 20 .NO $FFFA,$FF
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FFFA-00 80 21 .DA BE6502 ; NMI VECTOR
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FFFC-00 80 22 .DA BE6502 ; RESET VECTOR
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FFFE-00 80 23 .DA BE6502 ; IRQ VECTOR
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