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sa: add 4-channel KR4 file
This commit is contained in:
Vince Weaver
parent
59a26997d0
commit
2385c53473
@ -24,13 +24,13 @@ initial 40 col support: 18864
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have art loading properly 40col: 18910
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lz4 encode the ascii art: 15529
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revert because lz4 code not re-entrant: 18910
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add 4-channel music (KR4): 20128
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Memory Map
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Lowmem: 4k
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Code: 16k (8k=audio, 5k=lyrics, 3k=art)
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Code: 20k (8k=audio, 5k=lyrics, 3k=art)
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Sound buffers: 14k
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Sound buffer2: 14k?
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BIN
still_alive/SA.KR4
Normal file
BIN
still_alive/SA.KR4
Normal file
Binary file not shown.
@ -1,6 +1,6 @@
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;================================
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;================================
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; mockingboard interrupt handler
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; mockingboard KR4 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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@ -45,57 +45,57 @@ mb_write_frame:
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; loop through the 14 registers
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; reading the value, then write out
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;==================================
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; inlined "write_ay_both" to save up to 156 (12*13) cycles
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; unrolled
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; This is actually a KRW4 player
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; plays 4 channels, right is 123, left is 143
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; used for converted MOD files
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; To save space also no envelope support
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mb_write_loop:
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lda REGISTER_DUMP,X ; load register value ; 4
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cmp REGISTER_OLD,X ; compare with old values ; 4
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beq mb_no_write ; 3/2nt
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;=============
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; typ 11
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; special case R13. If it is 0xff, then don't update
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; otherwise might spuriously reset the envelope settings
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cpx #13 ; 2
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bne mb_not_13 ; 3/2nt
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cmp #$ff ; 2
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beq mb_skip_13 ; 3/2nt
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;============
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; typ 5
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mb_not_13:
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beq mb_no_write_left ; 3/2nt
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; address
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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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lda #MOCK_AY_LATCH_ADDR ; latch_address for PB1 ; 2
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sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
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sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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sta MOCK_6522_ORB2 ; 4
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; value
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lda REGISTER_DUMP,X ; load register value ; 4
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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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sta MOCK_6522_ORB1 ; write on PB1 ; 4
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sta MOCK_6522_ORB2 ; write on PB2 ; 4
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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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mb_no_write_left:
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lda REGISTER_DUMP2,X; load register value ; 4
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cmp REGISTER_OLD2,X ; compare with old values ; 4
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beq mb_no_write_right ; 3/2nt
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; address
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stx MOCK_6522_ORA2 ; put address on PA2 ; 4
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lda #MOCK_AY_LATCH_ADDR ; latch_address for PB1 ; 2
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sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB2 ; 4
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;===========
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; 62
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mb_no_write:
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; value
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lda REGISTER_DUMP2,X ; load register value ; 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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sta MOCK_6522_ORB2 ; write on PB2 ; 4
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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB2 ; 4
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mb_no_write_right:
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inx ; point to next register ; 2
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cpx #14 ; if 14 we're done ; 2
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cpx #12 ; if 14 we're done ; 2
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bmi mb_write_loop ; otherwise, loop ; 3/2nt
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;============
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; 7
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mb_skip_13:
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;=====================================
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@ -105,10 +105,10 @@ mb_skip_13:
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mb_reg_copy:
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lda REGISTER_DUMP,X ; load register value ; 4
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sta REGISTER_OLD,X ; compare with old values ; 4
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lda REGISTER_DUMP2,X; load register value ; 4
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sta REGISTER_OLD2,X ; compare with old values ; 4
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dex ; 2
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bpl mb_reg_copy ; 2nt/3
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;=============
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; 171
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;===================================
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; Load all 14 registers in advance
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@ -125,9 +125,29 @@ mb_load_values:
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mb_load_loop:
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lda (INL),y ; load register value ; 5
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cpx #11
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bne mb_load12
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mb_load11:
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sta REGISTER_DUMP2+2
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jmp mb_done_load
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mb_load12:
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cpx #12
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bne mb_load13
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sta REGISTER_DUMP2+3
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jmp mb_done_load
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mb_load13:
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cpx #12
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bne mb_regular_load
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sta REGISTER_DUMP2+9
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jmp mb_done_load
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mb_regular_load:
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sta REGISTER_DUMP,X ; 4
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;============
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; 9
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sta REGISTER_DUMP2,X
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mb_done_load:
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;====================
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; point to next page
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;====================
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@ -340,3 +360,6 @@ exit_interrupt:
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REGISTER_OLD:
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.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0
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REGISTER_OLD2:
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.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0
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@ -354,5 +354,5 @@ lyrics:
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.include "ascii_art.inc"
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LZ4_BUFFER:
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.incbin "SA.KRW"
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.incbin "SA.KR4"
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