Hi Michael...

Michael Karas wrote:
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P set, and applicable assembly language instructions, called a MAC. This MAC (multiplier and accumulator) is a feature not found on the 8051 derivatives I have looked at.

I know you mean MAC instruction, but there are at least two derivatives from Dallas/Maxim with a so-called 'Math Accelerator' (floating point), these are the DS80C390 and DS80C400. The 'Math Acc' features a rudimentary but useful MAC (multiply/divide and accumulate) unit with a 40-bit width accumulator, and the FP numbers have to be sequentially loaded in three into three dedicated registers, like the old Siemens/Infineon 80C537.

Regards,
Enrique.