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pt3: remove old stuff from interrupt handler
This commit is contained in:
Vince Weaver
parent
cff2778086
commit
f315061cae
@ -27,17 +27,31 @@ interrupt_handler:
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bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
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jmp exit_interrupt
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; jmp exit_interrupt
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; lda DONE_PLAYING ; 3
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; beq mb_play_music ; if song done, don't play music ; 3/2nt
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; jmp check_keyboard ; 3
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lda DONE_PLAYING ; 3
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beq pt3_play_music ; if song done, don't play music ; 3/2nt
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jmp check_keyboard ; 3
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;============
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; 13
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mb_play_music:
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pt3_play_music:
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; frame_num=0;
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; for(i=0;i < pt3.music_len;i++) {
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; pt3_set_pattern(i,&pt3);
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; for(j=0;j<64;j++) {
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; if (pt3_decode_line(&pt3)) break;
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; for(f=0;f<pt3.speed;f++) {
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; pt3_make_frame(&pt3,frame);
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; ym_play_frame(frame,shift_size,
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; &ds, diff_mode,play_music,mute_channel);
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; frame_num++;
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; }
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; }
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; }
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;======================================
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; Write frames to Mockingboard
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;======================================
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@ -55,15 +69,9 @@ 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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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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@ -108,137 +116,6 @@ mb_no_write:
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mb_skip_13:
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;=====================================
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; Copy registers to old
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;=====================================
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ldx #13 ; 2
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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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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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;===================================
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; note, assuming not cross page boundary, not any slower
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; then loading from zero page?
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mb_load_values:
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ldx #0 ; set up reg count ; 2
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ldy MB_CHUNK_OFFSET ; get chunk offset ; 3
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;=============
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; 5
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mb_load_loop:
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lda (INL),y ; load register value ; 5
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sta REGISTER_DUMP,X ; 4
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;============
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; 9
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;====================
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; point to next page
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;====================
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clc ; point to next interleaved ; 2
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lda INH ; page by adding CHUNKSIZE (3/1); 3
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adc CHUNKSIZE ; 3
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sta INH ; 3
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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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bmi mb_load_loop ; otherwise, loop ; 3/2nt
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;============
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; 18
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;=========================================
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; if A_COARSE_TONE is $ff then we are done
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lda A_COARSE_TONE ; 3
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bpl mb_not_done ; 3/2nt
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lda #1 ; set done playing ; 2
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jmp quiet_exit ; 3
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;===========
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; typ 6
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mb_not_done:
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;==============================================
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; incremement offset. If 0 move to next chunk
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;==============================================
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increment_offset:
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inc MB_CHUNK_OFFSET ; increment offset ; 5
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bne back_to_first_reg ; if not zero, done ; 3/2nt
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;=====================
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; move to next state
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;=====================
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clc
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rol DECODER_STATE ; next state ; 5
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; 20 -> 40 -> 80 -> c+00
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bcs wraparound_to_a ; 3/2nt
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bit DECODER_STATE ;bit7->N bit6->V
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bvs back_to_first_reg ; do nothing on B ; 3/2nt
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start_c:
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lda #1
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sta CHUNKSIZE
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; setup next three chunks of song
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lda #1 ; start decompressing
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sta DECOMPRESS_TIME ; outside of handler
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jmp back_to_first_reg
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wraparound_to_a:
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lda #$3
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sta CHUNKSIZE
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lda #$20
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sta DECODER_STATE
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sta COPY_TIME ; start copying
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lda DECOMPRESS_TIME
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beq blah
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lda #1
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sta DECODE_ERROR
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blah:
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;==============================
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; After 14th reg, reset back to
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; read R0 data
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;==============================
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back_to_first_reg:
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lda #0 ; 2
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bit DECODER_STATE ; 3
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bmi back_to_first_reg_c ; 2nt/3
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bvc back_to_first_reg_a ; 2nt/3
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back_to_first_reg_b:
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lda #$1 ; offset by 1
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back_to_first_reg_a:
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clc ; 2
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adc #>UNPACK_BUFFER ; in proper chunk 1 or 2 ; 2
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jmp update_r0_pointer ; 3
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back_to_first_reg_c:
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lda #>(UNPACK_BUFFER+$2A00) ; in linear C area ; 2
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update_r0_pointer:
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sta INH ; update r0 pointer ; 3
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;=================================
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; Finally done with this interrupt
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;=================================
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@ -352,7 +229,6 @@ quiet_exit:
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lda #0 ; 2
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mb_clear_reg:
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sta REGISTER_DUMP,X ; clear register value ; 4
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sta REGISTER_OLD,X ; clear old values ; 4
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dex ; 2
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bpl mb_clear_reg ; 2nt/3
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@ -374,5 +250,4 @@ exit_interrupt:
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; ???? cycles
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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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