我的代码提供了不支持的R-Type，如何正确地减去它。尝试更改其他细节....已经尝试使用subu ..................................... .................................................. ........
.data
str: .asciiz "\nHello World!\n"
# You can change what is between the quotes if you like
.text
.globl main
main:
# Do the addition
# For this, we first need to put the values
# to add into registers ($t0 and $t1)
li $t0, 30 # You can change the 10
li $t1, 20 # You can change the 20
# Now we can add the values in $t0
# and $t1, putting the result in special register $a0
sub $a0, $t0, $t1
# Set up for printing the value in $a0.
# A 1 in $v0 means we want to print an int
li $v0, 1
# The system call looks at what is in $v0
# and $a0, and knows to print what is in $a0
syscall
# Now we want to print Hello World
# So we load the (address of the) string into $a0
la $a0, str
# And put a 4 in $v0 to mean print a string
li $v0, 4
# And just like before syscall looks at
# $v0 and $a0 and knows to print the string
syscall
# Nicely end the program
li $v0, 0
jr $ra
答案 0 :(得分：1)
您的程序在import serial
ser = serial.Serial(port='/dev/ttyUSB0', baudrate=9600)
ser.write('0')
print ser.readline()
和tk.iconify()模拟器中运行良好，但除外，用于程序终止。这些模拟器没有设置mars，因此它为零。所以，最后，你会回到可能有半随机指令的东西，包括非法指令。因此，根本不是 你的spim就是问题所在。这是后来发生的事情。
变化：
$ra分为：
sub