mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-26 11:30:12 +00:00
438 lines
8.4 KiB
ArmAsm
438 lines
8.4 KiB
ArmAsm
; VMW Minimal Mockingboard Issue Reproducer
|
|
|
|
; ZP addresses
|
|
MB_CHUNK_OFFSET = $94
|
|
MB_VALUE = $91
|
|
|
|
|
|
|
|
; left speaker
|
|
MOCK_6522_1_ORB = $C400 ; 6522 #1 port b data
|
|
MOCK_6522_1_ORA = $C401 ; 6522 #1 port a data
|
|
MOCK_6522_1_DDRB = $C402 ; 6522 #1 data direction port B
|
|
MOCK_6522_1_DDRA = $C403 ; 6522 #1 data direction port A
|
|
MOCK_6522_1_T1C_L = $C404 ; 6522 #1 Low-order counter
|
|
MOCK_6522_1_T1C_H = $C405 ; 6522 #1 High-order counter
|
|
MOCK_6522_1_T1L_L = $C406 ; 6522 #1 Low-order latch
|
|
MOCK_6522_1_T1L_H = $C407 ; 6522 #1 High-order latch
|
|
MOCK_6522_1_T2C_L = $C408 ; 6522 #1 Timer2 Low-order Latch/Counter
|
|
MOCK_6522_1_T2C_H = $C409 ; 6522 #1 Timer2 High-order Latch/Counter
|
|
MOCK_6522_1_SR = $C40A ; 6522 #1 Shift Register
|
|
MOCK_6522_1_ACR = $C40B ; 6522 #1 Auxiliary Control Register
|
|
MOCK_6522_1_PCR = $C40C ; 6522 #1 Peripheral Control Register
|
|
MOCK_6522_1_IFR = $C40D ; 6522 #1 Interrupt Flag Register
|
|
MOCK_6522_1_IER = $C40E ; 6522 #1 Interrupt Enable Register
|
|
MOCK_6522_1_ORAN = $C40F ; 6522 #1 port a data, no handshake
|
|
|
|
; right speaker
|
|
MOCK_6522_2_ORB = $C480 ; 6522 #2 port b data
|
|
MOCK_6522_2_ORA = $C481 ; 6522 #2 port a data
|
|
MOCK_6522_2_DDRB = $C482 ; 6522 #2 data direction port B
|
|
MOCK_6522_2_DDRA = $C483 ; 6522 #2 data direction port A
|
|
MOCK_6522_2_T1C_L = $C484 ; 6522 #2 Low-order counter
|
|
MOCK_6522_2_T1C_H = $C485 ; 6522 #2 High-order counter
|
|
MOCK_6522_2_T1L_L = $C486 ; 6522 #2 Low-order latch
|
|
MOCK_6522_2_T1L_H = $C487 ; 6522 #2 High-order latch
|
|
MOCK_6522_2_T2C_L = $C488 ; 6522 #2 Timer2 Low-order Latch/Counter
|
|
MOCK_6522_2_T2C_H = $C489 ; 6522 #2 Timer2 High-order Latch/Counter
|
|
MOCK_6522_2_SR = $C48A ; 6522 #2 Shift Register
|
|
MOCK_6522_2_ACR = $C48B ; 6522 #2 Auxiliary Control Register
|
|
MOCK_6522_2_PCR = $C48C ; 6522 #2 Peripheral Control Register
|
|
MOCK_6522_2_IFR = $C48D ; 6522 #2 Interrupt Flag Register
|
|
MOCK_6522_2_IER = $C48E ; 6522 #2 Interrupt Enable Register
|
|
MOCK_6522_2_ORAN = $C48F ; 6522 #2 port a data, no handshake
|
|
|
|
|
|
;=========================
|
|
; Init Variables
|
|
;=========================
|
|
|
|
lda #$0
|
|
sta MB_CHUNK_OFFSET
|
|
|
|
;============================
|
|
; Init the Mockingboard
|
|
;============================
|
|
|
|
jsr mockingboard_init
|
|
jsr reset_ay_both
|
|
jsr clear_ay_both
|
|
|
|
;=========================
|
|
; Setup Interrupt Handler
|
|
;=========================
|
|
; Vector address goes to 0x3fe/0x3ff
|
|
|
|
lda #<interrupt_handler
|
|
sta $03fe
|
|
lda #>interrupt_handler
|
|
sta $03ff
|
|
|
|
;============================
|
|
; Enable 50Hz clock on 6522
|
|
;============================
|
|
|
|
sei ; disable interrupts just in case
|
|
|
|
lda #$40 ; Continuous interrupts, don't touch PB7
|
|
sta MOCK_6522_1_ACR ; ACR register
|
|
lda #$7F ; clear all interrupt flags
|
|
sta MOCK_6522_1_IER ; IER register (interrupt enable)
|
|
|
|
lda #$C0
|
|
sta MOCK_6522_1_IFR ; IFR: 1100 0000
|
|
; clear timer interrupt in flag register
|
|
; should we try to clear all?
|
|
|
|
sta MOCK_6522_1_IER ; IER: 1100 0000, enable timer1 interrupt
|
|
|
|
lda #$E7
|
|
sta MOCK_6522_1_T1C_L ; write into low-order latch
|
|
lda #$4f
|
|
sta MOCK_6522_1_T1C_H ; write into high-order latch,
|
|
; load both values into counter
|
|
; clear interrupt and start counting
|
|
; 4fe7 / 1e6 = .020s, 50Hz
|
|
|
|
|
|
;=========================
|
|
; Setup initial conditions
|
|
;=========================
|
|
|
|
|
|
; 5: C CHANNEL COARSE
|
|
; ldx #5
|
|
; lda #$0 ; always 0
|
|
; sta MB_VALUE
|
|
; jsr write_ay_both
|
|
|
|
; 7: ENABLE
|
|
ldx #7
|
|
lda #$38 ; noise disabled, ABC enabled
|
|
sta MB_VALUE
|
|
jsr write_ay_both
|
|
|
|
; 10: C Amplitude
|
|
ldx #10
|
|
lda #$c ; always volume 12
|
|
sta MB_VALUE
|
|
jsr write_ay_both
|
|
|
|
; 4: C CHANNEL FINE
|
|
ldx #4
|
|
lda #$51
|
|
sta MB_VALUE
|
|
jsr write_ay_both
|
|
|
|
|
|
;============================
|
|
; Enable 6502 interrupts
|
|
;============================
|
|
|
|
cli ; clear interrupt mask
|
|
|
|
;============================
|
|
; Loop forever
|
|
;============================
|
|
main_loop:
|
|
|
|
jmp main_loop
|
|
|
|
|
|
|
|
|
|
;=========
|
|
;routines
|
|
;=========
|
|
|
|
|
|
; AY-3-8910 commands on port B
|
|
; RESET BDIR BC1
|
|
MOCK_AY_RESET = $0 ; 0 0 0
|
|
MOCK_AY_INACTIVE = $4 ; 1 0 0
|
|
MOCK_AY_READ = $5 ; 1 0 1
|
|
MOCK_AY_WRITE = $6 ; 1 1 0
|
|
MOCK_AY_LATCH_ADDR = $7 ; 1 1 1
|
|
|
|
|
|
;========================
|
|
; Mockingboard Init
|
|
;========================
|
|
; Initialize the 6522s
|
|
; set the data direction for all pins of PortA/PortB to be output
|
|
|
|
mockingboard_init:
|
|
lda #$ff ; all 8 pins output (1), portA
|
|
|
|
sta MOCK_6522_1_DDRA
|
|
sta MOCK_6522_2_DDRA
|
|
; only 3 pins output (1), port B
|
|
lda #$7
|
|
sta MOCK_6522_1_DDRB
|
|
sta MOCK_6522_2_DDRB
|
|
|
|
|
|
rts
|
|
|
|
reset_ay_both:
|
|
;======================
|
|
; Reset Left AY-3-8910
|
|
;======================
|
|
reset_ay_left:
|
|
lda #MOCK_AY_RESET
|
|
sta MOCK_6522_1_ORB
|
|
lda #MOCK_AY_INACTIVE
|
|
sta MOCK_6522_1_ORB
|
|
|
|
;======================
|
|
; Reset Right AY-3-8910
|
|
;======================
|
|
reset_ay_right:
|
|
lda #MOCK_AY_RESET
|
|
sta MOCK_6522_2_ORB
|
|
lda #MOCK_AY_INACTIVE
|
|
sta MOCK_6522_2_ORB
|
|
rts
|
|
|
|
|
|
; Write sequence
|
|
; Inactive -> Latch Address -> Inactive -> Write Data -> Inactive
|
|
|
|
;=========================================
|
|
; Write Right/Left to save value AY-3-8910
|
|
;=========================================
|
|
; register in X
|
|
; value in MB_VALUE
|
|
|
|
write_ay_both:
|
|
|
|
write_ay_address:
|
|
|
|
; value
|
|
lda #$ff
|
|
sta MOCK_6522_1_DDRA
|
|
|
|
; address
|
|
stx MOCK_6522_1_ORA ; put address on PA1 ; 3
|
|
stx MOCK_6522_2_ORA ; put address on PA2 ; 3
|
|
lda #MOCK_AY_LATCH_ADDR ; latch_address on PB1 ; 2
|
|
sta MOCK_6522_1_ORB ; latch_address on PB1 ; 3
|
|
sta MOCK_6522_2_ORB ; latch_address on PB2 ; 3
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_1_ORB ; 3
|
|
sta MOCK_6522_2_ORB ; 3
|
|
|
|
write_ay_value:
|
|
|
|
; value
|
|
lda #$ff
|
|
sta MOCK_6522_1_DDRA
|
|
|
|
lda MB_VALUE ; 3
|
|
sta MOCK_6522_1_ORA ; put value on PA1 ; 3
|
|
sta MOCK_6522_2_ORA ; put value on PA2 ; 3
|
|
lda #MOCK_AY_WRITE ; ; 2
|
|
sta MOCK_6522_1_ORB ; write on PB1 ; 3
|
|
sta MOCK_6522_2_ORB ; write on PB2 ; 3
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_1_ORB ; 3
|
|
sta MOCK_6522_2_ORB ; 3
|
|
|
|
rts ; 6
|
|
;===========
|
|
; 53
|
|
|
|
|
|
read_ay_both:
|
|
|
|
; value
|
|
lda #$ff
|
|
sta MOCK_6522_1_DDRA
|
|
|
|
; address
|
|
stx MOCK_6522_1_ORA ; put address on PA1 ; 3
|
|
lda #MOCK_AY_LATCH_ADDR ; latch_address on PB1 ; 2
|
|
sta MOCK_6522_1_ORB ; latch_address on PB1 ; 3
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_1_ORB ; 3
|
|
|
|
read_ay_value:
|
|
; value
|
|
|
|
lda #$0
|
|
sta MOCK_6522_1_DDRA
|
|
|
|
lda #MOCK_AY_READ ; ; 2
|
|
sta MOCK_6522_1_ORB ; read on PB1 ; 3
|
|
|
|
ldy MOCK_6522_1_ORA ; read value
|
|
|
|
lda #MOCK_AY_INACTIVE ; go inactive ; 2
|
|
sta MOCK_6522_1_ORB ; 3
|
|
|
|
tya
|
|
|
|
rts ; 6
|
|
|
|
|
|
|
|
;=======================================
|
|
; clear ay -- clear all 14 AY registers
|
|
; should silence the card
|
|
;=======================================
|
|
clear_ay_both:
|
|
ldx #13
|
|
lda #0
|
|
sta MB_VALUE
|
|
clear_ay_left_loop:
|
|
jsr write_ay_both
|
|
dex
|
|
bpl clear_ay_left_loop
|
|
rts
|
|
|
|
|
|
|
|
|
|
|
|
;================================
|
|
;================================
|
|
; mockingboard interrupt handler
|
|
;================================
|
|
;================================
|
|
|
|
interrupt_handler:
|
|
pha ; save A ; 3
|
|
; Should we save X and Y too?
|
|
|
|
.if 0
|
|
lda MOCK_6522_1_IFR
|
|
tay
|
|
and #$f
|
|
clc
|
|
adc #'0'+$80
|
|
sta $401
|
|
tya
|
|
lsr
|
|
lsr
|
|
lsr
|
|
lsr
|
|
clc
|
|
adc #'0'+$80
|
|
sta $400
|
|
|
|
lda MOCK_6522_1_IER
|
|
tay
|
|
and #$f
|
|
clc
|
|
adc #'0'+$80
|
|
sta $403
|
|
tya
|
|
lsr
|
|
lsr
|
|
lsr
|
|
lsr
|
|
clc
|
|
adc #'0'+$80
|
|
sta $402
|
|
|
|
lda MOCK_6522_2_IFR
|
|
tay
|
|
and #$f
|
|
clc
|
|
adc #'0'+$80
|
|
sta $407
|
|
tya
|
|
lsr
|
|
lsr
|
|
lsr
|
|
lsr
|
|
clc
|
|
adc #'0'+$80
|
|
sta $406
|
|
|
|
lda MOCK_6522_2_IER
|
|
tay
|
|
and #$f
|
|
clc
|
|
adc #'0'+$80
|
|
sta $409
|
|
tya
|
|
lsr
|
|
lsr
|
|
lsr
|
|
lsr
|
|
clc
|
|
adc #'0'+$80
|
|
sta $408
|
|
.endif
|
|
|
|
|
|
|
|
bit MOCK_6522_1_T1C_L ; clear 6522 interrupt by
|
|
; reading T1C-L ; 4
|
|
|
|
mb_play_music:
|
|
|
|
|
|
;======================================
|
|
; Write frames to Mockingboard
|
|
;======================================
|
|
; actually plays frame loaded at end of
|
|
; last interrupt, so 20ms behind?
|
|
|
|
mb_write_frame:
|
|
|
|
ldy MB_CHUNK_OFFSET
|
|
|
|
|
|
; 4: C CHANNEL FINE
|
|
lda c_fine,Y
|
|
sta MB_VALUE
|
|
sta expected+4
|
|
|
|
ldx #4
|
|
jsr write_ay_both
|
|
; jsr write_ay_value
|
|
|
|
; read out all of AY registers and see if match expected
|
|
ldx #0
|
|
loop:
|
|
jsr read_ay_both
|
|
cmp expected,X
|
|
beq good
|
|
|
|
brk
|
|
|
|
good:
|
|
inx
|
|
cpx #14
|
|
bne loop
|
|
|
|
increment_offset:
|
|
inc MB_CHUNK_OFFSET ; increment offset
|
|
lda MB_CHUNK_OFFSET
|
|
and #$1
|
|
sta MB_CHUNK_OFFSET
|
|
|
|
done_interrupt:
|
|
pla ; restore a ; 4
|
|
rti ; return from interrupt ; 6
|
|
|
|
|
|
|
|
|
|
expected: ; 0 1 2 3 4 5 6 7 8 9 10 11 12 13
|
|
.byte $00,$00,$00,$00, $00,$00,$00,$38, $00,$00,$0c,$00, $00,$00
|
|
|
|
|
|
|
|
; 4: C fine
|
|
|
|
c_fine:
|
|
|
|
;.byte $51,$3c,$32,$50, $3d,$32,$50,$3c, $33,$50,$3c,$32,$51,$3c,$32,$50
|
|
|
|
.byte $50,$32,$32,$50, $3d,$32,$50,$3c, $33,$50,$3c,$32,$51,$3c,$32,$50
|
|
|
|
|