Parts of a Machine Instruction

The instruction addu $10, $9, $8 is stored as one 32-bit pattern. Each field of that pattern carries one of the four parts: the operation, the first source, the second source, and the destination.

32-bit machine instruction (hex 0x01285021) registers $9 = 34 $8 = 5 $10 = ? ALU add (from opcode)
operation (opcode) source 1 ($9) source 2 ($8) destination ($10)
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Press Play or Step to see which bits carry each part.