6

I don't know if it counts as a 16-bit historical computer, but there were a number of 80287 clones. One of them, from IIT, added a F4x4 instruction that operated on the entire FP stack to perform matrix operations (the IIT chip had not one, but four stacks of eight FPU registers each). A friend of mine had one of these coprocessors back in the day, and it ...


5

I think the big question you have to ask here is: What would such an instruction have been useful for? Single-bit data types don't usually go together with matrix operations. I've looked at some examples where the MMIX instructions are used, and they don't seem to be very compelling, given the hardware complexity of doing so. For example, if you want a ROL ...


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