osabi

void enable_syscalls(){
  *(unsigned char *)$D02F = $47;
  *(unsigned char *)$D02F = $53;
}
void call_syscall0(){
  enable_syscalls();
  *(unsigned char *)$D640 = $00;
  asm { nop }
}
void call_syscall1(){
  enable_syscalls();
  *(unsigned char *)$D641 = $01;
  asm { nop }
}

void print_string(char *string){
 enable_syscalls();
 char *address_start = (char *)$0300;
 while(*string){
  *address_start = *string;
  address_start++;
  string++;

 }
 *address_start = 0;
 call_syscall1();
 }