double: add mockingboard files
This commit is contained in:
Vince Weaver
parent
2ecf50f2c6
commit
5211fd633a
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@ -27,6 +27,7 @@ double.o: double.s \
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pt3_lib_mockingboard_setup.s pt3_lib_detect_model.s \
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zx02_optim.s copy_400.s gr_offsets.s vblank.s \
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lc_detect.s text_print.s title.s gr_fast_clear.s \
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interrupt_handler.s pt3_lib_mockingboard_patch.s \
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graphics/sworg_hgr.hgr.zx02 \
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graphics/sworg_dhgr.aux.zx02 \
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graphics/sworg_dhgr.bin.zx02 \
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@ -154,6 +154,41 @@ no_language_card:
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done_language_card:
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;===================================
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; Detect Mockingboard
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;===================================
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PT3_ENABLE_APPLE_IIC = 1
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; detect mockingboard
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jsr mockingboard_detect
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bcc mockingboard_notfound
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mockingboard_found:
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; print detected location
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lda #'S'+$80 ; change NO to slot
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sta $7d0+30
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lda MB_ADDR_H ; $C4 = 4, want $B4 1100 -> 1011
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and #$87
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ora #$30
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sta $7d0+31 ; 23,31
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; NOTE: in this game we need both language card && mockingboard
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; to enable mockingboard music
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lda SOUND_STATUS
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and #SOUND_IN_LC
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beq dont_enable_mc
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lda SOUND_STATUS
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ora #SOUND_MOCKINGBOARD
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sta SOUND_STATUS
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dont_enable_mc:
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mockingboard_notfound:
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skip_all_checks:
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@ -500,8 +535,10 @@ wait_until_keypress:
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.include "pt3_lib_detect_model.s"
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; .include "pt3_lib_mockingboard_setup.s"
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; .include "pt3_lib_mockingboard_detect.s"
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.include "pt3_lib_mockingboard_detect.s"
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.include "pt3_lib_mockingboard_setup.s"
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.include "interrupt_handler.s"
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.include "pt3_lib_mockingboard_patch.s"
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.include "zx02_optim.s"
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@ -0,0 +1,187 @@
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;================================
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;================================
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; mockingboard interrupt handler
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;================================
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;================================
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; On Apple II/6502 the interrupt handler jumps to address in 0xfffe
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; This is in the ROM, which saves the registers
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; on older IIe it saved A to $45 (which could mess with DISK II)
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; newer IIe doesn't do that.
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; It then calculates if it is a BRK or not (which trashes A)
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; Then it sets up the stack like an interrupt and calls 0x3fe
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; Note: the IIc is much more complicated
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; its firmware tries to decode the proper source
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; based on various things, including screen hole values
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; we bypass that by switching out ROM and replacing the
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; $fffe vector with this, but that does mean we have
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; to be sure status flag and accumulator set properly
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interrupt_handler:
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php ; save status flags
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cld ; clear decimal mode
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pha ; save A ; 3
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; A is saved in $45 by firmware
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txa
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pha ; save X
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tya
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pha ; save Y
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; inc $0404 ; debug (flashes char onscreen)
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inc TIMER_COUNT
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pt3_irq_smc1:
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bit MOCK_6522_T1CL ; clear 6522 interrupt by reading T1C-L ; 4
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lda DONE_PLAYING ; 3
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beq ym_play_music ; if song done, don't play music ; 3/2nt
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jmp done_pt3_irq_handler ; 3
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;============
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; 13
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ym_play_music:
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; see if need to pre-load next chunk
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lda BASE_FRAME_L
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cmp #1
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bne no_preload_chunk
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lda BASE_FRAME_H
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and #1
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bne no_preload_chunk
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inc LOAD_NEXT_CHUNK ; defer this until after interrupt
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no_preload_chunk:
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lda BASE_FRAME_L ; reset frame pointer to beginning
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sta CURRENT_FRAME_L
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lda BASE_FRAME_H
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sta CURRENT_FRAME_H
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ldx #0
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frame_loop:
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ldy #0
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lda (CURRENT_FRAME_L),Y
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cmp #$ff
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bne all_good
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cpx #1 ; see if A coarse is $FF
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beq go_next_chunk ; if so, end of song, loop
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all_good:
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jsr update_ay_register ; output to the AY
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clc
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lda CURRENT_FRAME_H ; next register set is 2 pages away
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adc #$2 ; was 4
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sta CURRENT_FRAME_H
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inx
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cpx #12 ; only output 11 regs
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bne frame_loop
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inc BASE_FRAME_L ; increment frame ptr (16bit)
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bne not_oflo
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inc BASE_FRAME_H ; wrap to next page
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lda BASE_FRAME_H ; if too big, go to next chunk
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and #$3
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cmp #$2 ; was D4
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bne not_oflo
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go_next_chunk:
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lda CHUNK_NEXT_PLAY ; toggle $D0/$E8
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eor #$38
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sta CHUNK_NEXT_PLAY
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sta BASE_FRAME_H
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lda #0
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sta BASE_FRAME_L ; in case song ended early
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inc CURRENT_CHUNK ; point to next chunk
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; inc LOAD_NEXT_CHUNK ; defer this until after interrupt
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; jsr load_song_chunk
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not_oflo:
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exit_interrupt:
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pla
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tay ; restore Y
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pla
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tax ; restore X
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pla ; restore a ; 4
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; on II+/IIe (but not IIc) we need to do this?
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interrupt_smc:
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lda $45 ; restore A
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plp
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rti ; return from interrupt ; 6
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;============
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; typical
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; ???? cycles
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;=========================
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; update ay_register
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; reg in X
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; value in A
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update_ay_register:
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pt3_irq_smc2:
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stx MOCK_6522_ORA1 ; put address on PA1 ; 4
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stx MOCK_6522_ORA2 ; put address on PA2 ; 4
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ldy #MOCK_AY_LATCH_ADDR ; latch_address for PB1 ; 2
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pt3_irq_smc3:
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sty MOCK_6522_ORB1 ; latch_address on PB1 ; 4
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sty MOCK_6522_ORB2 ; latch_address on PB2 ; 4
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ldy #MOCK_AY_INACTIVE ; go inactive ; 2
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pt3_irq_smc4:
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sty MOCK_6522_ORB1 ; 4
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sty MOCK_6522_ORB2 ; 4
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; value
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pt3_irq_smc5:
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sta MOCK_6522_ORA1 ; put value on PA1 ; 4
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sta MOCK_6522_ORA2 ; put value on PA2 ; 4
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lda #MOCK_AY_WRITE ; ; 2
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pt3_irq_smc6:
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sta MOCK_6522_ORB1 ; write on PB1 ; 4
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sty MOCK_6522_ORB1 ; 4
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pt3_irq_smc7:
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sta MOCK_6522_ORB2 ; write on PB2 ; 4
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sty MOCK_6522_ORB2 ; 4
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rts
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done_pt3_irq_handler:
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disable_music:
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sei
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ldx #1
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stx DONE_PLAYING
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jsr clear_ay_both
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; mute the sound
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ldx #7
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lda #$ff
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jsr update_ay_register
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rts
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@ -0,0 +1,120 @@
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;===================================================================
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; code to patch mockingboard if not in slot#4
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;===================================================================
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; this is the brute force version, we have to patch 39 locations
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; see further below if you want to try a smaller, more dangerous, patch
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.if 0
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mockingboard_patch:
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lda MB_ADDR_H
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sta pt3_irq_smc1+2 ; 1
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sta pt3_irq_smc2+2 ; 2
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sta pt3_irq_smc2+5 ; 3
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sta pt3_irq_smc3+2 ; 4
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sta pt3_irq_smc3+5 ; 5
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sta pt3_irq_smc4+2 ; 6
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sta pt3_irq_smc4+5 ; 7
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sta pt3_irq_smc5+2 ; 8
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sta pt3_irq_smc5+5 ; 9
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sta pt3_irq_smc6+2 ; 10
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sta pt3_irq_smc6+5 ; 11
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sta pt3_irq_smc7+2 ; 12
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sta pt3_irq_smc7+5 ; 13
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sta mock_init_smc1+2 ; 14
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sta mock_init_smc1+5 ; 15
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sta mock_init_smc2+2 ; 16
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sta mock_init_smc2+5 ; 17
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sta reset_ay_smc1+2 ; 18
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sta reset_ay_smc2+2 ; 19
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sta reset_ay_smc3+2 ; 20
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sta reset_ay_smc4+2 ; 21
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sta write_ay_smc1+2 ; 22
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sta write_ay_smc1+5 ; 23
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sta write_ay_smc2+2 ; 24
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sta write_ay_smc2+5 ; 25
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sta write_ay_smc3+2 ; 26
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sta write_ay_smc3+5 ; 27
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sta write_ay_smc4+2 ; 28
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sta write_ay_smc4+5 ; 29
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sta write_ay_smc5+2 ; 30
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sta write_ay_smc5+5 ; 31
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sta write_ay_smc6+2 ; 32
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sta write_ay_smc6+5 ; 33
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sta setup_irq_smc1+2 ; 34
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sta setup_irq_smc2+2 ; 35
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sta setup_irq_smc3+2 ; 36
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sta setup_irq_smc4+2 ; 37
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sta setup_irq_smc5+2 ; 38
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sta setup_irq_smc6+2 ; 39
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rts
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.endif
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;===================================================================
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; dangerous code to patch mockingboard if not in slot#4
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;===================================================================
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; this code patches any $C4 value to the proper slot# if not slot4
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; this can be dangerous, it might over-write other important values
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; that should be $C4
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; safer ways to do this:
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; only do this if 2 bytes after a LDA/STA/LDX/STX
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; count total and if not 39 then print error message
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mockingboard_patch:
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; from mockingboard_init $1BBF
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; to done_pt3_irq_handler $1D85
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ldx MB_ADDR_H
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ldy #0
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lda #<mockingboard_init
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sta MB_ADDR_L
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lda #>mockingboard_init
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sta MB_ADDR_H
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mb_patch_loop:
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lda (MB_ADDR_L),Y
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cmp #$C4
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bne mb_patch_nomatch
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txa
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sta (MB_ADDR_L),Y
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mb_patch_nomatch:
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; 16-bit increment
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inc MB_ADDR_L
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bne mb_patch_oflo
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inc MB_ADDR_H
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mb_patch_oflo:
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lda MB_ADDR_H
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cmp #>done_pt3_irq_handler
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bne mb_patch_loop
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lda MB_ADDR_L
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cmp #<done_pt3_irq_handler
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bne mb_patch_loop
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mb_patch_done:
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rts
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@ -20,8 +20,23 @@ BASH = $29
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V2 = $2D
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COLOR = $30
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; ym player
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CURRENT_FRAME_L = $70
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CURRENT_FRAME_H = $71
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BASE_FRAME_L = $72
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BASE_FRAME_H = $73
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CURRENT_CHUNK = $74
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TIME_MINUTES = $75
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TIME_SECONDS = $76
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CURSOR_X = $77
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DRAW_PAGE = $7A
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CHUNK_NEXT_LOAD = $7D
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CHUNK_NEXT_PLAY = $7E
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LOAD_NEXT_CHUNK = $7F
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TIMER_COUNT = $81
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APPLEII_MODEL = $8B
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SOUND_STATUS = $DE
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@ -39,11 +54,15 @@ HGRPAGE = $E6
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TEMPY = $F0
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XX = $F1
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; rest of pt3_player
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LOOP = $F4
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MB_VALUE = $F5
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MB_ADDR_L = $F6
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MB_ADDR_H = $F7
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DONE_PLAYING = $F8
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DONE_SONG = $F9
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MB_VALUE = $F7
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MB_ADDR_L = $F8
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MB_ADDR_H = $F9
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YPOS = $FA
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TCOLOR = $FB
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