Syscalls:

Service		Code    Arguments	Result

print_int	1	$a0 = integer

print_float	2	$f12 = float

print_double	3	$f12 = double

print_string	4	$a0 = string

read_int	5			integer(in $v0)

read_float	6			float(in $f0)

read_double	7			double(in $f0)

read_string	8	$a0 = buffer, $a1 = length

sbrk		9	$a0 = amount

exit	       10

print_char     11	$a0 = character
			prints ASCII character corresponding
			to contents of low-order byte of $a0
			Note: value 10 corresponds to _new line_

read_char      12			ASCII char(in $a0)