Service	Syscall Code	Arguments	Result
print_int	1	$a0=integer to print
print_float	2	$f12= float to print
print_double	3	$f12 = double to print
print_string	4	$a0 = address of string
read_int	5		$v0 holds integer
read_float	6		$f0 holds float
read_double	7		$f0 holds double
read_string	8	$a0=buffer, $a1=length
sbrk	9
exit	10
print_char	11	$a0 = char to print
read_char	12		$v0 holds char