mirror of
https://github.com/bobbimanners/emailler.git
synced 2024-11-18 21:07:03 +00:00
230 lines
3.4 KiB
ArmAsm
230 lines
3.4 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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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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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
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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 :+
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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
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header_length: .res 1
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sidfile_length: .res 2
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.rodata
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songs:
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.byte "SONGS $",0
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error:
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.byte "ERROR",13,0
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init_address:
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.byte "LOAD ADDRESS $",0
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play_address:
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.byte "PLAY ADDRESS $",0
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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 "Y-Out.sid"
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.incbin "outlaw.sid"
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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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init_song:
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jmp $ffff
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play_song:
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jmp $ffff
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jmp_old_irq:
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jmp $ffff
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