[cc65] c64 autostart code

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From: MagerValp (MagerValp_at_cling.gu.se)
Date: 2003-10-29 18:48:33 

Just in case someone wants to make autostarting c64 code with ca65,
here's how I did it. Assemble with cl65 -t none -C autostart.cfg
autostart.s. Thanks again Uz for helping me with ld65 :)

I'd appreciate it if someone with "exotic" drives (ramlink, ide64, and
others that patch kernal vectors) could verify that this still works.
Drop me a mail in private with your findings. Thanks!


----- autostart.cfg -----
MEMORY {
    ZP: start = $02, size = $1a, type = rw;
    LOADADDR:    start = $02a5, size = 2,  file = %O;
    STARTLO:     start = $02a7, size = 91, file = %O, fill = yes;
    STARTVECTOR: start = $0302, size = 2,  file = %O;
    STARTHI:     start = $0304, size = 16, file = %O;
}
SEGMENTS {
    LOADADDR: load = LOADADDR, type = rw;
    STARTLO: load = STARTLO, type = rw;
    STARTVECTOR: load = STARTVECTOR, type = rw;
    STARTHI: load = STARTHI, type = rw;
    ZEROPAGE: load = ZP, type = zp;
}
-----


----- autostart.s -----
	.segment "LOADADDR"

	.addr * + 2


	.segment "STARTLO"

init:
	ldx #16
:	lda message-1,x
	jsr $ffd2
	dex
	bne :-
	stx $d020
	stx $d021
:	sta $d800,x
	sta $d900,x
	sta $da00,x
	sta $db00,x
	inx
	bne :-
	jsr $e453
	jmp *


	.segment "STARTVECTOR"

	.addr init


	.segment "STARTHI"

message:
	.byte 13, "'NITSET-A TSUJ",147
-----

-- 
    ___          .     .  .         .       . +  .         .      o   
  _|___|_   +   .  +     .     +         .  Per Olofsson, arkadspelare
    o-o    .      .     .   o         +          MagerValp_at_cling.gu.se
     -       +            +    .     http://www.cling.gu.se/~cl3polof/
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