mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-16 08:05:31 +00:00
157 lines
2.5 KiB
ArmAsm
157 lines
2.5 KiB
ArmAsm
; ZZ points to offset from pointer
|
|
|
|
|
|
;D0 F1 ;0 $9000,$9100,$9200 = A Low (reg0)
|
|
;D1 F2 ;1 $9300,$9400,$9500 = A high (reg1) [top], B high (reg3) [bottom]
|
|
;D2 F3 ;2 $9600,$9700,$9800 = B Low (reg2)
|
|
;D3 F4 ;3 $9900,$9A00,$9B00 = C Low (reg4)
|
|
;D4 F5 ;4 $9C00,$9D00,$9E00 = Envelope Shape (r13) [top], C high (reg5) [bot]
|
|
;D5 F6 ;5 $9F00,$A000,$A100 = Noise (r6), bit7 = don't change envelope
|
|
;D6 F7 ;6 $A200,$A300,$A400 = Enable (r7)
|
|
;D7 F8 ;7 $A500,$A600,$A700 = A amp (r8), bit 5 of r8,r9,r10
|
|
;D8 F9 ;8 $A800,$A900,$AA00 = C amp (r10) [top], B amp (r9) [bottom]
|
|
;D9 FA ;9 $AB00,$AC00,$AD00 = ENV low (r11)
|
|
;DA FB ;a $AE00,$AF00,$B000 = ENV high (r12)
|
|
|
|
|
|
pt3_write_frame:
|
|
|
|
ldy FRAME_OFFSET ; 3
|
|
|
|
;=====================
|
|
; Register 0: A fine
|
|
lda A_FINE_TONE
|
|
r0_wrsmc:
|
|
sta $D000,Y
|
|
|
|
;==========================
|
|
; Register 1/3: A/B coarse
|
|
lda A_COARSE_TONE
|
|
asl
|
|
asl
|
|
asl
|
|
asl
|
|
ora B_COARSE_TONE
|
|
r1_wrsmc:
|
|
sta $D100,Y
|
|
|
|
;====================
|
|
; Register 2: B fine
|
|
lda B_FINE_TONE
|
|
r2_wrsmc:
|
|
sta $D200,Y
|
|
|
|
;====================
|
|
; Register 3: B coarse already done
|
|
|
|
|
|
;=============================
|
|
; Register 4: C fine
|
|
lda C_FINE_TONE
|
|
r4_wrsmc:
|
|
sta $D300,Y
|
|
|
|
;=======================================
|
|
; Register 5: Envelope Shape [top] / C coarse [bottom]
|
|
lda C_COARSE_TONE
|
|
and #$f
|
|
sta C_COARSE_TEMP
|
|
|
|
lda ENVELOPE_SHAPE
|
|
cmp #$ff
|
|
beq no_envelope
|
|
yes_envelope:
|
|
|
|
lda ENVELOPE_SHAPE
|
|
asl
|
|
asl
|
|
asl
|
|
asl
|
|
ora C_COARSE_TEMP
|
|
sta C_COARSE_TEMP
|
|
|
|
lda #0
|
|
jmp done_envelope
|
|
no_envelope:
|
|
lda #$80
|
|
done_envelope:
|
|
sta ENV_SHAPE_TEMP
|
|
|
|
lda C_COARSE_TEMP
|
|
r13_wrsmc:
|
|
sta $D400,Y
|
|
|
|
|
|
;=====================
|
|
; Register 6: Noise
|
|
lda NOISE
|
|
and #$1f
|
|
ora ENV_SHAPE_TEMP
|
|
r6_wrsmc:
|
|
sta $D500,Y
|
|
|
|
;=====================
|
|
; Register 7: Enable
|
|
lda ENABLE
|
|
r7_wrsmc:
|
|
sta $D600,Y
|
|
|
|
;=====================
|
|
; Register 8: a-amp
|
|
|
|
lda A_VOLUME
|
|
and #$1f
|
|
sta A_VOL_TEMP
|
|
|
|
lda B_VOLUME
|
|
and #$10
|
|
asl
|
|
ora A_VOL_TEMP
|
|
sta A_VOL_TEMP
|
|
|
|
lda C_VOLUME
|
|
and #$10
|
|
asl
|
|
asl
|
|
ora A_VOL_TEMP
|
|
r8_wrsmc:
|
|
sta $D700,Y
|
|
|
|
;============================
|
|
; Register 9/10: b-amp (bottom) , c-amp (top)
|
|
|
|
lda B_VOLUME
|
|
and #$f
|
|
sta A_VOL_TEMP
|
|
|
|
lda C_VOLUME
|
|
asl
|
|
asl
|
|
asl
|
|
asl
|
|
ora A_VOL_TEMP
|
|
r9_wrsmc:
|
|
sta $D800,Y
|
|
|
|
;=====================
|
|
; Register 10: c-amp already handled
|
|
|
|
|
|
;=====================
|
|
; Register 11: E fine
|
|
lda ENVELOPE_FINE
|
|
r11_wrsmc:
|
|
sta $D900,Y
|
|
|
|
;=======================
|
|
; Register 12: E coarse
|
|
lda ENVELOPE_COARSE
|
|
r12_wrsmc:
|
|
sta $DA00,Y
|
|
|
|
;=============================
|
|
; Register 13: already handled
|
|
|
|
rts ; 6
|
|
|