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mockingboard: rename some things
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Vince Weaver
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4d54f1f1a7
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153
asm_routines/mockingboard.s
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153
asm_routines/mockingboard.s
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; Mockingboad programming:
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; + Has two 6522 I/O chips connected to two AY-3-8910 chips
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; + Optionally has some speech chips controlled via the outport on the AY
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; + Often in slot 4
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; TODO: how to auto-detect?
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; References used:
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; http://macgui.com/usenet/?group=2&id=8366
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; 6522 Data Sheet
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; AY-3-8910 Data Sheet
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;========================
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; Mockingboard card
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; Essentially two 6522s hooked to the Apple II bus
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; Connected to AY-3-8910 chips
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; PA0-PA7 on 6522 connected to DA0-DA7 on AY
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; PB0 on 6522 connected to BC1
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; PB1 on 6522 connected to BDIR
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; PB2 on 6522 connected to RESET
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; left speaker
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MOCK_6522_ORB1 EQU $C400 ; 6522 #1 port b data
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MOCK_6522_ORA1 EQU $C401 ; 6522 #1 port a data
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MOCK_6522_DDRB1 EQU $C402 ; 6522 #1 data direction port B
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MOCK_6522_DDRA1 EQU $C403 ; 6522 #1 data direction port A
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; right speaker
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MOCK_6522_ORB2 EQU $C480 ; 6522 #2 port b data
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MOCK_6522_ORA2 EQU $C481 ; 6522 #2 port a data
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MOCK_6522_DDRB2 EQU $C482 ; 6522 #2 data direction port B
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MOCK_6522_DDRA2 EQU $C483 ; 6522 #2 data direction port A
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; AY-3-8910 commands on port B
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; RESET BDIR BC1
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MOCK_AY_RESET EQU $0 ; 0 0 0
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MOCK_AY_INACTIVE EQU $4 ; 1 0 0
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MOCK_AY_READ EQU $5 ; 1 0 1
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MOCK_AY_WRITE EQU $6 ; 1 1 0
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MOCK_AY_LATCH_ADDR EQU $7 ; 1 1 1
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;========================
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; Mockingboard Init
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;========================
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; Initialize the 6522s
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; set the data direction for all pins of PortA/PortB to be output
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mockingboard_init:
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lda #$ff ; all output (1)
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sta MOCK_6522_DDRB1
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sta MOCK_6522_DDRA1
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sta MOCK_6522_DDRB2
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sta MOCK_6522_DDRA2
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rts
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;======================
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; Reset Left AY-3-8910
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;======================
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reset_ay_left:
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lda #MOCK_AY_RESET
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sta MOCK_6522_ORB1
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lda #MOCK_AY_INACTIVE
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sta MOCK_6522_ORB1
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rts
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;======================
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; Reset Right AY-3-8910
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;======================
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reset_ay_right:
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lda #MOCK_AY_RESET
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sta MOCK_6522_ORB2
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lda #MOCK_AY_INACTIVE
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sta MOCK_6522_ORB2
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rts
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; Write sequence
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; Inactive -> Latch Address -> Inactive -> Write Data -> Inactive
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;=======================
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; Write Right AY-3-8910
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;=======================
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; register in Y
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; value in X
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write_ay_right:
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; address
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sty MOCK_6522_ORA1 ; put address on PA
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lda #MOCK_AY_LATCH_ADDR ; latch_address on PB
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sta MOCK_6522_ORB1
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lda #MOCK_AY_INACTIVE ; go inactive
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sta MOCK_6522_ORB1
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; value
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stx MOCK_6522_ORA1 ; put value on PA
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lda #MOCK_AY_WRITE ; write on PB
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sta MOCK_6522_ORB1
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lda #MOCK_AY_INACTIVE ; go inactive
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sta MOCK_6522_ORB1
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rts
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;=======================
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; Write Left AY-3-8910
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;=======================
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; register in X
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; value in Y
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write_ay_left:
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; address
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sty MOCK_6522_ORA2 ; put address on PA
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lda #MOCK_AY_LATCH_ADDR ; latch_address on PB
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sta MOCK_6522_ORB2
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lda #MOCK_AY_INACTIVE ; go inactive
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sta MOCK_6522_ORB2
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; value
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stx MOCK_6522_ORA2 ; put value on PA
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lda #MOCK_AY_WRITE ; write on PB
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sta MOCK_6522_ORB2
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lda #MOCK_AY_INACTIVE ; go inactive
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sta MOCK_6522_ORB2
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rts
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;=======================================
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; clear ay -- clear all 14 AY registers
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; should silence the card
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;=======================================
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clear_ay_left:
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ldy #14
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ldx #0
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clear_ay_left_loop:
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jsr write_ay_left
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dey
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bpl clear_ay_left_loop
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rts
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;=======================================
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; clear ay -- clear all 14 AY registers
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; should silence the card
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;=======================================
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clear_ay_right:
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ldy #14
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ldx #0
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clear_ay_right_loop:
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jsr write_ay_right
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dey
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bpl clear_ay_right_loop
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rts
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@ -5,14 +5,14 @@ PNG2GR = ../gr-utils/png2gr
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all: dump_ed mock.dsk
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mock.dsk: MOCK_TEST
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$(DOS33) -y mock_test.dsk BSAVE -a 0x1000 MOCK_TEST
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mock.dsk: KSP_THEME_UNCOMPRESSED
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$(DOS33) -y mock_test.dsk BSAVE -a 0x1000 KSP_THEME_UNCOMPRESSED
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MOCK_TEST: mock_test.o
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ld65 -o MOCK_TEST mock_test.o -C ./apple2_1000.inc
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KSP_THEME_UNCOMPRESSED: ksp_theme_uncompressed.o
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ld65 -o KSP_THEME_UNCOMPRESSED ksp_theme_uncompressed.o -C ./apple2_1000.inc
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mock_test.o: mock_test.s
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ca65 -o mock_test.o mock_test.s -l mock_test.lst
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ksp_theme_uncompressed.o: ksp_theme_uncompressed.s
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ca65 -o ksp_theme_uncompressed.o ksp_theme_uncompressed.s -l ksp_theme_uncompressed.lst
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ED: duet.o
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ld65 -o ED duet.o -C ./apple2_900.inc
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@ -31,5 +31,5 @@ dump_ed: dump_ed.o notes.o
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clean:
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rm -f *~ TITLE.GR *.o *.lst ED MOCK_TEST dump_ed
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rm -f *~ TITLE.GR *.o *.lst ED KSP_THEME_UNCOMPRESSED dump_ed
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