Converting binary/hexadecimal to MIPS instructions

secondubly

For the following entries, what instructions do they represent respectively?

Binary: 00000001110001011000100000100001

Hexadecimal: 144FFF9D

I'm completely lost on what I'm doing here - searching online has produced a bunch of results that make very little sense to me, but what I've gathered is I'm basically supposed to match up the numbers to their appropriate instructions/registers, but how exactly do I know what those are? Where can I find a comprehensive list? How do I know whether it's an R I or J format function?

Scott Hunter

The first 6 bits (it is easier to work in binary) are the opcode, from which you can determine how to interpret the rest. This site should get you started: http://www.mrc.uidaho.edu/mrc/people/jff/digital/MIPSir.html

Update: Calling the first 6 bits the opcode is (to be too kind) misleading, but it is enough to tell you how to interpret the rest of the instruction; you may need to look elsewhere (typically at the end of the instruction) for the complete determination of the opcode.

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