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https://github.com/bobbimanners/emailler.git
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102 lines
1.4 KiB
ArmAsm
102 lines
1.4 KiB
ArmAsm
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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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init_song=$1000
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play_song=$1003
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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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ldax #sid_data+2
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stax copy_src
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ldax $4000
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stax copy_dest
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jsr copymem
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ldax $4000
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stax copy_src
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ldax $1000
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stax copy_dest
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jsr copymem
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lda #0
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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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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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inc $d020
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jsr play_song
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dec $d020
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jmp jmp_old_irq
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.bss
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.rodata
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sid_data:
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;.incbin "Melonix.sid"
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; .incbin "Power_Train.sid"
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.incbin "zigzag.prg"
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included_sid_length=*-sid_data
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.data
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irq_handler_installed_flag: .byte 0
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jmp_old_irq:
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jmp $ffff
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