split: adding sound support

This commit is contained in:
Vince Weaver 2018-07-06 10:56:50 -04:00
parent 596b1dbcc7
commit f1f75c2ae2
4 changed files with 203 additions and 13 deletions

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@ -32,7 +32,7 @@ RAINBOW: rainbow.o
RAINBOW.BAS: rainbow.bas
$(TOKENIZE) < rainbow.bas > RAINBOW.BAS
credits.o: credits.s tfv_sprites.inc
credits.o: credits.s tfv_sprites.inc mockingboard.s
ca65 -o credits.o credits.s -l credits.lst
CREDITS: credits.o

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@ -1,26 +1,18 @@
.include "zp.inc"
H2 = $2C
; V2 = $2D
; TEMPY = $FB
FRAME = $60
TREE1X = $61
TREE2X = $62
HGR = $F3E2
HPLOT0 = $F457
HCOLOR = $F6EC
; HLINE = $F819
; VLINE = $F828
; COLOR = $F864
; TEXT = $FB36
; HOME = $FC58
;===================
; init screen
jsr TEXT
jsr HOME
;==================
; Init vars
lda #28
sta TREE1X
lda #37
@ -32,6 +24,14 @@
lda #0
sta DRAW_PAGE
;==========================
; setup mockingboard
jsr mockingboard_detect_slot4
;==========================
; setup text screen
lda #0
sta CH
sta CV
@ -642,6 +642,7 @@ line5:.asciiz " . . . "
line6:.asciiz " . "
.include "../asm_routines/text_print.s"
.include "mockingboard.s"
.align $100
.include "../asm_routines/gr_offsets.s"
@ -649,4 +650,8 @@ line6:.asciiz " . "
.align $1000
graphics:
.incbin "KATC.BIN"
music:
.incbin "music.tfv"

185
split_screen/mockingboard.s Normal file
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@ -0,0 +1,185 @@
; ZP addresses
; left channel
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 channel
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
; 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
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
; AY-3-8913: Wait 5 us
nop
nop
nop
nop
nop
;======================
; 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
; AY-3-8913: Wait 5 us
nop
nop
nop
nop
nop
;=========================
; Setup initial conditions
;=========================
; 7: ENABLE
ldx #7
lda #$38 ; noise disabled, ABC enabled
sta MB_VALUE
jsr write_ay_both
rts
;=========================================
; Write Right/Left to save value AY-3-8910
;=========================================
; register in X
; value in MB_VALUE
write_ay_both:
; 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
; value
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
;=======================================
; Detect a Mockingboard card in Slot4
;=======================================
; Based on code from the French Touch "Pure Noise" Demo
; Attempts to time an instruction sequence with a 6522
;
; MB_ADDRL:MB_ADDRH has address of Mockingboard
; returns X=0 if not found, X=1 if found
mockingboard_detect_slot4:
lda #0
sta MB_ADDRL
mb4_detect_loop: ; self-modifying
lda #$04 ; we're only looking in Slot 4
ora #$C0 ; make it start with C
sta MB_ADDRH
ldy #04 ; $CX04
ldx #02 ; 2 tries?
mb4_check_cycle_loop:
lda (MB_ADDRL),Y ; timer 6522 (Low Order Counter)
; count down
sta TEMP ; 3 cycles
lda (MB_ADDRL),Y ; + 5 cycles = 8 cycles
; between the two accesses to the timer
sec
sbc TEMP ; subtract to see if we had 8 cycles
cmp #$f8 ; -8
bne mb4_not_in_this_slot
dex ; decrement, try one more time
bne mb4_check_cycle_loop ; loop detection
inx ; Mockingboard found (X=1)
done_mb4_detect:
rts ; return
mb4_not_in_this_slot:
ldx #00
beq done_mb4_detect

BIN
split_screen/music.tfv Normal file

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