mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-20 03:35:24 +00:00
675 lines
17 KiB
ArmAsm
675 lines
17 KiB
ArmAsm
;================================
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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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TIME_OFFSET EQU 13
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interrupt_handler:
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pha ; save A ; 3
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; Should we save X and Y too?
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; inc $0404 ; debug (flashes char onscreen)
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bit $C404 ; clear 6522 interrupt by reading T1C-L ; 4
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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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;============
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; 13
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mb_play_music:
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;======================================
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; Write frames to Mockingboard
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;======================================
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; actually plays frame loaded at end of
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; last interrupt, so 20ms behind?
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mb_write_frame:
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;==================================
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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_r0_right:
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lda REGISTER_DUMP+0 ; load register value ; 3
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cmp REGISTER_OLD+0 ; compare with old values ; 4
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beq mb_write_r1_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #0 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+0 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r1_right:
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lda REGISTER_DUMP+1 ; load register value ; 3
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cmp REGISTER_OLD+1 ; compare with old values ; 4
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beq mb_write_r2_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #1 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+1 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r2_right:
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lda REGISTER_DUMP+2 ; load register value ; 3
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cmp REGISTER_OLD+2 ; compare with old values ; 4
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beq mb_write_r3_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #2 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+2 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r3_right:
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lda REGISTER_DUMP+3 ; load register value ; 3
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cmp REGISTER_OLD+3 ; compare with old values ; 4
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beq mb_write_r4_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #3 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+3 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r4_right:
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lda REGISTER_DUMP+4 ; load register value ; 3
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cmp REGISTER_OLD+4 ; compare with old values ; 4
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beq mb_write_r5_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #4 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+4 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r5_right:
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lda REGISTER_DUMP+5 ; load register value ; 3
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cmp REGISTER_OLD+5 ; compare with old values ; 4
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beq mb_write_r6_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #5 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+5 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r6_right:
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lda REGISTER_DUMP+6 ; load register value ; 3
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cmp REGISTER_OLD+6 ; compare with old values ; 4
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beq mb_write_r7_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #6 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+6 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r7_right:
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lda REGISTER_DUMP+7 ; load register value ; 3
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cmp REGISTER_OLD+7 ; compare with old values ; 4
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beq mb_write_r8_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #7 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+7 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r8_right:
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lda REGISTER_DUMP+8 ; load register value ; 3
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cmp REGISTER_OLD+8 ; compare with old values ; 4
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beq mb_write_r9_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #8 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+8 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r9_right:
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lda REGISTER_DUMP+9 ; load register value ; 3
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cmp REGISTER_OLD+9 ; compare with old values ; 4
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beq mb_write_r10_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #9 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+9 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r10_right:
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lda REGISTER_DUMP+10; load register value ; 3
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cmp REGISTER_OLD+10 ; compare with old values ; 4
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beq mb_write_r11_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #10 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+10 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r11_right:
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lda REGISTER_DUMP+11; load register value ; 3
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cmp REGISTER_OLD+11 ; compare with old values ; 4
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beq mb_write_r12_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #11 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+11 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r12_right:
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lda REGISTER_DUMP+12; load register value ; 3
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cmp REGISTER_OLD+12 ; compare with old values ; 4
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beq mb_write_r13_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #12 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+12 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_r13_right:
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lda REGISTER_DUMP+13; load register value ; 3
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cmp REGISTER_OLD+13 ; compare with old values ; 4
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beq mb_write_done_right ; 3/2nt
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cmp #$ff ; if FF we skip r13 ; 2
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beq mb_write_done_right ; 3/2nt
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;=============
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; typ 10
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; address
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ldx #13 ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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; value
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lda REGISTER_DUMP+13 ; load register value ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 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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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 4
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;===========
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; 37
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mb_write_done_right:
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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
|
|
sta DECOMPRESS_TIME ; outside of handler
|
|
|
|
jmp back_to_first_reg
|
|
|
|
wraparound_to_a:
|
|
lda #$3
|
|
sta CHUNKSIZE
|
|
lda #$20
|
|
sta DECODER_STATE
|
|
sta COPY_TIME ; start copying
|
|
|
|
lda DECOMPRESS_TIME
|
|
beq blah
|
|
lda #1
|
|
sta DECODE_ERROR
|
|
blah:
|
|
;==============================
|
|
; After 14th reg, reset back to
|
|
; read R0 data
|
|
;==============================
|
|
|
|
back_to_first_reg:
|
|
lda #0 ; 2
|
|
bit DECODER_STATE ; 3
|
|
bmi back_to_first_reg_c ; 2nt/3
|
|
bvc back_to_first_reg_a ; 2nt/3
|
|
|
|
back_to_first_reg_b:
|
|
lda #$1 ; offset by 1
|
|
|
|
back_to_first_reg_a:
|
|
clc ; 2
|
|
adc #>UNPACK_BUFFER ; in proper chunk 1 or 2 ; 2
|
|
|
|
jmp update_r0_pointer ; 3
|
|
|
|
back_to_first_reg_c:
|
|
lda #>(UNPACK_BUFFER+$2A00) ; in linear C area ; 2
|
|
|
|
update_r0_pointer:
|
|
sta INH ; update r0 pointer ; 3
|
|
|
|
|
|
|
|
;=================================
|
|
; Finally done with this interrupt
|
|
;=================================
|
|
|
|
done_interrupt:
|
|
|
|
|
|
;=====================
|
|
; Update time counter
|
|
;=====================
|
|
update_time:
|
|
inc FRAME_COUNT ; 5
|
|
lda FRAME_COUNT ; 3
|
|
cmp #50 ; 3
|
|
bne done_time ; 3/2nt
|
|
|
|
lda #$0 ; 2
|
|
sta FRAME_COUNT ; 3
|
|
|
|
update_second_ones:
|
|
inc $7d0+TIME_OFFSET+3 ; 6
|
|
inc $bd0+TIME_OFFSET+3 ; 6
|
|
lda $bd0+TIME_OFFSET+3 ; 4
|
|
cmp #$ba ; one past '9' ; 2
|
|
bne done_time ; 3/2nt
|
|
lda #'0'+$80 ; 2
|
|
sta $7d0+TIME_OFFSET+3 ; 4
|
|
sta $bd0+TIME_OFFSET+3 ; 4
|
|
update_second_tens:
|
|
inc $7d0+TIME_OFFSET+2 ; 6
|
|
inc $bd0+TIME_OFFSET+2 ; 6
|
|
lda $bd0+TIME_OFFSET+2 ; 4
|
|
cmp #$b6 ; 6 (for 60 seconds) ; 2
|
|
bne done_time ; 3/2nt
|
|
lda #'0'+$80 ; 2
|
|
sta $7d0+TIME_OFFSET+2 ; 4
|
|
sta $bd0+TIME_OFFSET+2 ; 4
|
|
update_minutes:
|
|
inc $7d0+TIME_OFFSET ; 6
|
|
inc $bd0+TIME_OFFSET ; 6
|
|
; we don't handle > 9:59 songs yet
|
|
done_time:
|
|
;=============
|
|
; 90 worst
|
|
|
|
|
|
;=================================
|
|
; Moved visualization here as a hack
|
|
;=================================
|
|
|
|
;============================
|
|
; Visualization
|
|
;============================
|
|
|
|
jsr clear_top
|
|
lda RASTERBARS_ON
|
|
beq skip_rasters
|
|
jsr draw_rasters
|
|
skip_rasters:
|
|
jsr volume_bars
|
|
jsr page_flip
|
|
|
|
|
|
check_keyboard:
|
|
|
|
jsr get_key
|
|
lda LASTKEY
|
|
beq exit_interrupt
|
|
|
|
cmp #(' '+$80)
|
|
bne key_R
|
|
key_space:
|
|
lda #$80
|
|
eor DONE_PLAYING
|
|
jmp quiet_exit
|
|
|
|
key_R:
|
|
cmp #'R'
|
|
bne key_left
|
|
|
|
lda #$ff
|
|
eor RASTERBARS_ON
|
|
sta RASTERBARS_ON
|
|
jmp done_key
|
|
|
|
key_left:
|
|
cmp #'A'
|
|
bne key_right
|
|
|
|
lda #$40
|
|
bne quiet_exit
|
|
|
|
key_right:
|
|
cmp #'D'
|
|
bne done_key
|
|
|
|
lda #$20
|
|
bne quiet_exit
|
|
|
|
done_key:
|
|
jmp exit_interrupt
|
|
|
|
quiet_exit:
|
|
sta DONE_PLAYING
|
|
jsr clear_ay_both
|
|
|
|
;=====================================
|
|
; clear register area
|
|
;=====================================
|
|
ldx #13 ; 2
|
|
lda #0 ; 2
|
|
mb_clear_reg:
|
|
sta REGISTER_DUMP,X ; clear register value ; 4
|
|
sta REGISTER_OLD,X ; clear old values ; 4
|
|
dex ; 2
|
|
bpl mb_clear_reg ; 2nt/3
|
|
|
|
exit_interrupt:
|
|
|
|
pla ; restore a ; 4
|
|
|
|
rti ; return from interrupt ; 6
|
|
|
|
;============
|
|
; typical
|
|
; 1358 cycles
|
|
|
|
|
|
REGISTER_OLD:
|
|
.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0
|