• reads MIPS assembly language files and translates to machine language
• executes the machine language instructions
• hows contents of registers and memory
• works as a debugger (supports break-points and single-stepping)
• provides basic OS-like services, like simple I/O

SPIM is available online for FREE and if you would like to download it, here is the link ! Below is the simplest example on how to use MIPS simulator, a.k.a QtSPIM (click on the images for a better view)  :

STEP 1: Load the .asm file into QtSpim. Look at the changes in text display.

STEP 2: press F10 to execute the next instruction.

STEP 3:  Press F10 to see the changes.

STEP 4:  The result is 5 in register $10.

Have fun exploring MIPS and SPIM :)

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