mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-07-06 07:28:58 +00:00
187 lines
2.8 KiB
ArmAsm
187 lines
2.8 KiB
ArmAsm
; ZZ points to offset from pointer
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;0 $9000,$9100,$9200 = A Low (reg0)
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;1 $9300,$9400,$9500 = A high (reg1) [top], B high (reg3) [bottom]
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;2 $9600,$9700,$9800 = B Low (reg2)
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;3 $9900,$9A00,$9B00 = C Low (reg4)
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;4 $9C00,$9D00,$9E00 = Envelope Shape (r13) [top], C high (reg5) [bot]
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;5 $9F00,$A000,$A100 = Noise (r6), bit7 = don't change envelope
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;6 $A200,$A300,$A400 = Enable (r7)
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;7 $A500,$A600,$A700 = A amp (r8), bit 5 of r8,r9,r10
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;8 $A800,$A900,$AA00 = C amp (r10) [top], B amp (r9) [bottom]
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;9 $AB00,$AC00,$AD00 = ENV low (r11)
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;a $AE00,$AF00,$B000 = ENV high (r12)
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pt3_write_frame:
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ldy FRAME_OFFSET ; 3
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;=====================
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; Register 0: A fine
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lda A_FINE_TONE
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r0_wrsmc:
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sta $9000,Y
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;==========================
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; Register 1/3: A/B coarse
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lda A_COARSE_TONE
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asl
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asl
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asl
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asl
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ora B_COARSE_TONE
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r1_wrsmc:
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sta $9300,Y
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;====================
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; Register 2: B fine
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lda B_FINE_TONE
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r2_wrsmc:
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sta $9600,Y
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;====================
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; Register 3: B coarse already done
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;=============================
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; Register 4: C fine
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lda C_FINE_TONE
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r4_wrsmc:
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sta $9900,Y
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;=======================================
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; Register 5: Envelope Shape [top] / C coarse [bottom]
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lda C_COARSE_TONE
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and #$f
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sta C_COARSE_TONE
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lda ENVELOPE_SHAPE
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cmp #$ff
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beq no_envelope
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yes_envelope:
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lda ENVELOPE_SHAPE
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asl
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asl
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asl
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asl
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ora C_COARSE_TONE
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sta C_COARSE_TONE
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lda #0
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sta ENVELOPE_SHAPE
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jmp done_envelope
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no_envelope:
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lda #$80
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sta ENVELOPE_SHAPE
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done_envelope:
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lda C_COARSE_TONE
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r13_wrsmc:
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sta $9C00,Y
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;=====================
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; Register 6: Noise
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lda NOISE
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and #$1f
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ora ENVELOPE_SHAPE
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r6_wrsmc:
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sta $9F00,Y
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;=====================
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; Register 7: Enable
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lda ENABLE
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r7_wrsmc:
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sta $A200,Y
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;=====================
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; Register 8: a-amp
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lda A_VOLUME
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and #$1f
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sta A_VOLUME
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lda B_VOLUME
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and #$10
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asl
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ora A_VOLUME
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sta A_VOLUME
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lda C_VOLUME
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and #$10
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asl
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asl
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ora A_VOLUME
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r8_wrsmc:
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sta $A500,Y
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;============================
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; Register 9/10: b-amp (bottom) , c-amp (top)
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lda B_VOLUME
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and #$f
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sta B_VOLUME
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lda C_VOLUME
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asl
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asl
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asl
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asl
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ora B_VOLUME
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r9_wrsmc:
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sta $A800,Y
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;=====================
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; Register 10: c-amp already handled
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;=====================
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; Register 11: E fine
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lda ENVELOPE_FINE
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r11_wrsmc:
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sta $AB00,Y
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;=======================
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; Register 12: E coarse
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lda ENVELOPE_COARSE
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r12_wrsmc:
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sta $AE00,Y
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;=============================
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; Register 13: already handled
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.if 0
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no_frame_wrap:
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; -1
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; delay 72+1-3=70
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lda #43 ; 70-2-25=43
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jsr delay_a
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jmp done_frame_wrap ; 3
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frame_wrap:
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inc r0_smc+2 ; 6
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inc r1_smc+2 ; 6
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inc r2_smc+2 ; 6
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inc r4_smc+2 ; 6
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inc r5_smc+2 ; 6
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inc r13_smc+2 ; 6
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inc r6_smc+2 ; 6
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inc r7_smc+2 ; 6
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inc r8_smc+2 ; 6
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inc r9_smc+2 ; 6
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inc r11_smc+2 ; 6
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inc r12_smc+2 ; 6
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;=====
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; 72
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done_frame_wrap:
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.endif
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rts ; 6
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