mirror of
https://github.com/bobbimanners/emailler.git
synced 2025-01-20 21:29:48 +00:00
git-svn-id: http://svn.code.sf.net/p/netboot65/code@194 93682198-c243-4bdb-bd91-e943c89aac3b
This commit is contained in:
jonnosan
parent
18ea7216d8
commit
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272
client/examples/raster.s
Normal file
272
client/examples/raster.s
Normal file
@ -0,0 +1,272 @@
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.include "../inc/common.i"
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print_a = $ffd2
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SCREEN_RAM = $0400
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COLOUR_RAM = $d800
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VIC_CTRL_A = $d011
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VIC_RASTER_REG = $d012
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VIC_CTRL_B = $d016
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VIC_MEMORY_CTRL=$d018
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VIC_IRQ_FLAG = $d019
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IRQ_VECTOR=$314
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BORDER_COLOR = $d020
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BACKGROUND_COLOR_0 = $d021
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SCROLL_DELAY=4
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CHARS_PER_LINE = 40
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SCROLL_LINE=12
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SCROLL_RAM = SCREEN_RAM+(SCROLL_LINE*CHARS_PER_LINE)
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TOP_BORDER_SCAN_LINES = 50
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BLACK = 0
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WHITE = 1
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RED = 2
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CYAN = 3
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PURPLE = 4
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GREEN = 5
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BLUE = 6
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YELLOW = 7
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ORANGE = 8
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BROWN = 9
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LIGHT_RED = 10
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DARK_GRAY = 11
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GRAY = 12
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LIGHT_GREEN = 13
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LIGHT_BLUE = 14
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LIGHT_GRAY = 15
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.macro wait_next_raster
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lda VIC_RASTER_REG
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:
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cmp VIC_RASTER_REG
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beq :-
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.endmacro
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.zeropage
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temp_buff: .res 2
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pptr: .res 2
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.bss
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.segment "STARTUP" ;this is what gets put at the start of the file on the C64
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.word basicstub ; load address
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basicstub:
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.word @nextline
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.word 2003
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.byte $9e
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.byte <(((init / 1000) .mod 10) + $30)
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.byte <(((init / 100 ) .mod 10) + $30)
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.byte <(((init / 10 ) .mod 10) + $30)
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.byte <(((init ) .mod 10) + $30)
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.byte 0
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@nextline:
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.word 0
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.code
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init:
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lda #0
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jsr clear_screen
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lda #DARK_GRAY
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sta BORDER_COLOR
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lda #YELLOW
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sta BACKGROUND_COLOR_0
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sei ;disable maskable IRQs
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lda #$7f
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sta $dc0d ;disable timer interrupts which can be generated by the two CIA chips
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sta $dd0d ;the kernal uses such an interrupt to flash the cursor and scan the keyboard, so we better
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;stop it.
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lda $dc0d ;by reading this two registers we negate any pending CIA irqs.
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lda $dd0d ;if we don't do this, a pending CIA irq might occur after we finish setting up our irq.
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;we don't want that to happen.
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lda #$01 ;this is how to tell the VICII to generate a raster interrupt
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sta $d01a
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lda #$00 ;this is how to tell at which rasterline we want the irq to be triggered
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sta VIC_RASTER_REG
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ldax IRQ_VECTOR
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stax old_irq
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jsr set_next_irq_jump
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cli ;enable maskable interrupts again
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lda #23
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@endless_loop:
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nop
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inc $ff
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inc $400
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tsx
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stx $410
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sta $411
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ldy #$80
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:
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iny
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bne :-
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jmp @endless_loop
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clear_screen:
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ldx #$00
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lda #$41
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:
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sta SCREEN_RAM,x
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sta SCREEN_RAM+$100,x
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sta SCREEN_RAM+$200,x
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sta SCREEN_RAM+$300,x
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sta COLOUR_RAM,x
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sta COLOUR_RAM+$100,x
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sta COLOUR_RAM+$200,x
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sta COLOUR_RAM+$300,x
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dex
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bne :-
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rts
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set_next_irq_jump:
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inc jump_counter
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lda jump_counter
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asl
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asl
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load_next_raster_entry:
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tax
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lda raster_jump_table,x ;bit 9 of raster to trigger on
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cmp #$ff
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bne not_last_entry
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lda #0
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sta jump_counter
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jmp load_next_raster_entry
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not_last_entry:
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ora #$18 ;turn on bits 3 & 4
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sta VIC_CTRL_A
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lda raster_jump_table+1,x ;bits 0..7 of raster to trigger on
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sta VIC_RASTER_REG
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lda raster_jump_table+2,x ;LSB of IRQ handler
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sta IRQ_VECTOR
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lda raster_jump_table+3,x ;LSB of IRQ handler
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sta IRQ_VECTOR+1
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rts
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exit_from_irq:
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jsr set_next_irq_jump
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jmp_to_original_irq_handler:
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lda #$ff ;this is the orthodox and safe way of clearing the interrupt condition of the VICII.
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sta VIC_IRQ_FLAG;if you don't do this the interrupt condition will be present all the time and you end
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;up having the CPU running the interrupt code all the time, as when it exists the
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;interrupt, the interrupt request from the VICII will be there again regardless of the
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;rasterline counter.
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old_irq = * + 1 ; Placeholder for self-modifying code
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jmp $ffff
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raster_irq:
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ldax #synchronised_irq
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stax IRQ_VECTOR
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nop ; waste at least 12 cycles
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nop ; (up to 64 cycles delay allowed here)
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nop
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nop
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nop
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nop
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inc VIC_RASTER_REG ; At this stage, we have already moved to the next line
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lda #1
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sta VIC_IRQ_FLAG ; acknowledge the first raster interrupt
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cli ; enable interrupts (the second interrupt can now occur)
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ldy #9
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dey
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bne *-1 ; delay
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nop ; The second interrupt will occur while executing these
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nop ; two-cycle instructions.
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nop
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nop
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nop
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jmp jmp_to_original_irq_handler
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synchronised_irq:
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ldx VIC_RASTER_REG
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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bit $24 ; 6569, 63 cycles/line
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cpx VIC_RASTER_REG ; The comparison cycle is executed CYCLES or CYCLES+1 cycles
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; after the interrupt has occurred.
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beq :+ ; Delay by one cycle if $d012 hadn't changed.
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; Now exactly CYCLES+3 cycles have passed since the interrupt
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:
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;now got a stable raster
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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inc BORDER_COLOR
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inc BACKGROUND_COLOR_0
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ldx #20
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@loop:
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wait_next_raster
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dex
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bne @loop
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dec BORDER_COLOR
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dec BACKGROUND_COLOR_0
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jmp exit_from_irq
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.data
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raster_jump_table:
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;format:
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;offset meaning
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; $00 BIT 9 OF RASTER TO TRIGGER ON ($00 if bit 8 =0 , $80 if bit 8 =1)
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; $01 BITS 0..7 OF RASTER TO TRIGGER ON
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; $02 LSB OF ROUTINE TO JUMP TO
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; $03 MSB OF ROUTINE TO JUMP TO
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;table needs to end with a single byte $ff
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;table needs to be sorted by scanlines
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; .byte $0,$01
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; .word scroll_text_irq
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.byte $0,$81
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.word raster_irq
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; .byte $0,$80
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; .word raster_irq
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.byte $ff ;end of list
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jump_counter: .byte 0
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229
client/examples/sidplay.s
Normal file
229
client/examples/sidplay.s
Normal file
@ -0,0 +1,229 @@
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.include "../inc/common.i"
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.include "../inc/commonprint.i"
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.import cfg_get_configuration_ptr
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.import copymem
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.importzp copy_src
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.importzp copy_dest
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.import ascii_to_native
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.zeropage
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.segment "STARTUP" ;this is what gets put at the start of the file on the C64
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.word basicstub ; load address
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basicstub:
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.word @nextline
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.word 2003
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.byte $9e
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.byte <(((init / 1000) .mod 10) + $30)
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.byte <(((init / 100 ) .mod 10) + $30)
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.byte <(((init / 10 ) .mod 10) + $30)
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.byte <(((init ) .mod 10) + $30)
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.byte 0
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@nextline:
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.word 0
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init:
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lda #14
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jsr print_a
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ldax #included_sid_length
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stax sidfile_length
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ldax #sid_data
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jsr load_sid
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bcc @ok
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ldax #error
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jmp print
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@ok:
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lda default_song
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jsr init_song
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jsr install_irq_handler
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@loop:
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jmp @loop
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rts
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load_sid:
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stax sidfile_address
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stax copy_src
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ldy #1
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lda (copy_src),y
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cmp #'S' ;make sure the file starts with 'PSID' or 'RSID'
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beq @ok
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sec
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rts
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@ok:
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ldy #7
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lda (copy_src),y
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sta header_length
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inc header_length
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inc header_length
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tay
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;y now points to the start of the real c64 file
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lda (copy_src),y
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sta copy_dest
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iny
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lda (copy_src),y
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sta copy_dest+1
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ldy #$0a
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lda (copy_src),y
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sta init_song+2
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iny
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lda (copy_src),y
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sta init_song+1
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iny
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lda (copy_src),y
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sta play_song+2
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iny
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lda (copy_src),y
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sta play_song+1
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ldy #$0f
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lda (copy_src),y
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sta number_of_songs
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ldy #$11
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lda (copy_src),y
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sta default_song
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ldy #$16
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jsr print_ascii_string
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ldy #$36
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jsr print_ascii_string
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ldy #$56
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jsr print_ascii_string
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ldax #songs
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jsr print
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lda number_of_songs
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jsr print_hex
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jsr print_cr
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ldax #init_address
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jsr print
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lda init_song+2
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jsr print_hex
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lda init_song+1
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jsr print_hex
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jsr print_cr
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ldax #play_address
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jsr print
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lda play_song+2
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jsr print_hex
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lda play_song+1
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jsr print_hex
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jsr print_cr
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ldax sidfile_address
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stax copy_src
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clc
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lda sidfile_address
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adc header_length
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pha
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lda sidfile_address+1
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adc #0
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tax
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pla
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stax copy_src
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sec
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lda sidfile_length
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sbc header_length
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pha
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lda sidfile_length+1
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sbc #0
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tax
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pla
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jsr copymem
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clc
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rts
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install_irq_handler:
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ldax $314 ;previous IRQ handler
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stax jmp_old_irq+1
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sei ;don't want any interrupts while we fiddle with the vector
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ldax #irq_handler
|
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stax $314 ;previous IRQ handler
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sta irq_handler_installed_flag
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cli
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rts
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irq_handler:
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lda $d012
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cmp #100
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bne irq_handler
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lda $01
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pha
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lda #$35
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sta $01
|
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|
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inc $d020
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jsr play_song
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dec $d020
|
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pla
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sta $01
|
||||
jmp jmp_old_irq
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||||
|
||||
|
||||
print_ascii_string:
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||||
:
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lda (copy_src),y
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beq :+
|
||||
jsr ascii_to_native
|
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jsr print_a
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||||
iny
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||||
bne :-
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||||
:
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||||
jmp print_cr
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||||
|
||||
|
||||
|
||||
.bss
|
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number_of_songs: .res 1
|
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default_song: .res 1
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sidfile_address: .res 2
|
||||
header_length: .res 1
|
||||
sidfile_length: .res 2
|
||||
|
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.rodata
|
||||
|
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songs:
|
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.byte "SONGS $",0
|
||||
error:
|
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.byte "ERROR",13,0
|
||||
init_address:
|
||||
.byte "LOAD ADDRESS $",0
|
||||
play_address:
|
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.byte "PLAY ADDRESS $",0
|
||||
|
||||
sid_data:
|
||||
;.incbin "Melonix.sid"
|
||||
; .incbin "Power_Train.sid"
|
||||
; .incbin "Y-Out.sid"
|
||||
.incbin "outlaw.sid"
|
||||
|
||||
included_sid_length=*-sid_data
|
||||
.data
|
||||
|
||||
irq_handler_installed_flag: .byte 0
|
||||
|
||||
init_song:
|
||||
jmp $ffff
|
||||
play_song:
|
||||
jmp $ffff
|
||||
jmp_old_irq:
|
||||
jmp $ffff
|
||||
|
||||
101
client/examples/sidplay_zigzag.s
Normal file
101
client/examples/sidplay_zigzag.s
Normal file
@ -0,0 +1,101 @@
|
||||
|
||||
.include "../inc/common.i"
|
||||
.include "../inc/commonprint.i"
|
||||
|
||||
.import cfg_get_configuration_ptr
|
||||
.import copymem
|
||||
.importzp copy_src
|
||||
.importzp copy_dest
|
||||
.import ascii_to_native
|
||||
|
||||
.zeropage
|
||||
|
||||
.segment "STARTUP" ;this is what gets put at the start of the file on the C64
|
||||
|
||||
.word basicstub ; load address
|
||||
|
||||
init_song=$1000
|
||||
play_song=$1003
|
||||
|
||||
basicstub:
|
||||
.word @nextline
|
||||
.word 2003
|
||||
.byte $9e
|
||||
.byte <(((init / 1000) .mod 10) + $30)
|
||||
.byte <(((init / 100 ) .mod 10) + $30)
|
||||
.byte <(((init / 10 ) .mod 10) + $30)
|
||||
.byte <(((init ) .mod 10) + $30)
|
||||
.byte 0
|
||||
@nextline:
|
||||
.word 0
|
||||
|
||||
init:
|
||||
|
||||
|
||||
|
||||
ldax #sid_data+2
|
||||
stax copy_src
|
||||
|
||||
ldax $4000
|
||||
stax copy_dest
|
||||
|
||||
jsr copymem
|
||||
|
||||
|
||||
ldax $4000
|
||||
stax copy_src
|
||||
|
||||
ldax $1000
|
||||
stax copy_dest
|
||||
|
||||
jsr copymem
|
||||
|
||||
lda #0
|
||||
jsr init_song
|
||||
jsr install_irq_handler
|
||||
@loop:
|
||||
jmp @loop
|
||||
rts
|
||||
|
||||
|
||||
|
||||
clc
|
||||
rts
|
||||
|
||||
|
||||
install_irq_handler:
|
||||
ldax $314 ;previous IRQ handler
|
||||
stax jmp_old_irq+1
|
||||
sei ;don't want any interrupts while we fiddle with the vector
|
||||
ldax #irq_handler
|
||||
stax $314 ;previous IRQ handler
|
||||
sta irq_handler_installed_flag
|
||||
cli
|
||||
rts
|
||||
|
||||
irq_handler:
|
||||
inc $d020
|
||||
jsr play_song
|
||||
dec $d020
|
||||
jmp jmp_old_irq
|
||||
|
||||
|
||||
|
||||
|
||||
.bss
|
||||
|
||||
.rodata
|
||||
|
||||
sid_data:
|
||||
;.incbin "Melonix.sid"
|
||||
; .incbin "Power_Train.sid"
|
||||
.incbin "zigzag.prg"
|
||||
|
||||
included_sid_length=*-sid_data
|
||||
.data
|
||||
|
||||
irq_handler_installed_flag: .byte 0
|
||||
|
||||
jmp_old_irq:
|
||||
jmp $ffff
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user