mirror of
https://github.com/ksherlock/itty-bitty-vtty.git
synced 2024-11-21 20:30:56 +00:00
200 lines
2.3 KiB
ArmAsm
200 lines
2.3 KiB
ArmAsm
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lst off
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cas se
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rel
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xc
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xc
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use apple2gs.equ
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mx %11
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*
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*
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* keypress @ 44.1 - 28 samples of $40, 29 samples of $b0
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*
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* beep - repeat keypress 53 times
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*
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* by adjusting rate, only need 1 sample each.
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*
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* w/ 2 oscillators, scan rate = 223.7 kHz ~5x 44.1
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* 28 samples * 5 = 142
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* res = 7. (1 << 16) / 142 = ~ 461
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* freq = 461, res = 7, wave size = 256 --> n * 461 >> 16
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*
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*
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*
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* vt52
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* keypress - ~730 samples, $40, curve to 0 or $b0, curve to 0
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* beep 14 keypresses
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*
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*
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bic mac
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if #=]1
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and ]1!$ffff
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else
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err 1 ; immediate only.
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fin
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<<<
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docwait mac
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if MX<2
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err 1 ; 8-bit m only
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fin
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wait lda SGCONTROL
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bmi wait
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<<<
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docmode mac
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docwait
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bic #%01000000 ; DOC mode
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ora #%00100000 ; auto-incr
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ora #%0000_1111 ; max volume.
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sta SGCONTROL
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<<<
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rammode mac
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docwait
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ora #%01100000 ; RAM mode, auto-incr
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sta SGCONTROL
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<<<
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init_audio ent
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docmode
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* 4 oscillators. -- (2 for key, 2 for beep -- stereo!)
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lda #$e1
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sta SGADDRL
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lda #4*2
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sta SGDATA
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* control registers
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* just set them off. channels will be set when they fire.
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lda #$a0
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sta SGADDRL
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lda #%0000_0_01_1 ; ch 0, interrupts off, 1-shot, halted.
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sta SGDATA
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sta SGDATA
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sta SGDATA
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sta SGDATA
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* freq low
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lda #$00
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sta SGADDRL
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lda #<650
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sta SGDATA
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sta SGDATA
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sta SGDATA
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sta SGDATA
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* freq high
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lda #$20
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sta SGADDRL
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lda #>650
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sta SGDATA
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sta SGDATA
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sta SGDATA
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sta SGDATA
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* volume
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lda #$40
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sta SGADDRL
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lda #$ff
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sta SGDATA
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sta SGDATA
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sta SGDATA
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sta SGDATA
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* wave table
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lda #$80
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sta SGADDRL
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lda #0 ; page 0
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sta SGDATA
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sta SGDATA
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inc ; page 1
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sta SGDATA
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sta SGDATA
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* wave table size
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lda #$c0
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sta SGADDRL
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lda #%00_000_111 ; 256 bytes, 16-bit shift
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sta SGDATA
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sta SGDATA
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sta SGDATA
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sta SGDATA
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; now copy the data....
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rammode
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stz SGADDRL
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stz SGADDRH
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ldy #key_size
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ldx #0
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]loop lda key_data,x
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sta SGDATA
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inx
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dey
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bpl ]loop
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stz SGADDRL
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lda #1
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sta SGADDRH
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ldy #beep_size
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ldx #0
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]loop lda beep_data,x
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sta SGDATA
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inx
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dey
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bpl ]loop
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rts
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beep ent
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; fire osc 2 + 3
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docmode
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lda #$a0+2
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sta SGADDRL
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lda #%0000_0_01_0 ; ch 0, interrupts off, 1-shot, running.
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ldx #%0001_0_01_0 ; ch 1, interrupts off, 1-shot, running.
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sta SGDATA
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stx SGDATA
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rts
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key_data
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db $01
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db $ff
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db $00
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key_size equ *-key_data
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beep_data
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lup 53
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db $01
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db $ff
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--^
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db $0
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beep_size equ *-beep_data
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sav vt100.beep.L
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