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49 lines
765 B
ArmAsm
49 lines
765 B
ArmAsm
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.include "../inc/common.i"
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.include "../inc/a2keycodes.i"
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.import print_a
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.import print_cr
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pptr=$04 ;temp pointer for printing from
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.segment "C700"
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;Autostart 'signature' bytes - make this rom look like a Disk ][ controller card
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.byte $c9,$20,$c9,$00,$c9,$03,$c9,$3c
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ldax #hello_world
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jsr print
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rts
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sta $cfff ;turn of all other expansion ROMs
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sta $c0f4 ;set bank
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ldax #$c800
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jsr print
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rts
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print:
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sta pptr
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stx pptr + 1
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@print_loop:
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ldy #0
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lda (pptr),y
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beq @done_print
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jsr print_a
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inc pptr
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bne @print_loop
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inc pptr+1
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bne @print_loop ;if we ever get to $ffff, we've probably gone far enough ;-)
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@done_print:
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rts
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hello_world:
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.byte "hello from autostart firmware land!",13,0
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