Delete comment from: Ken Shirriff's blog

Joe Zbiciak said...

A later TI part, the TMS320C80 DSP, implemented a 3-operand boolean unit with selectable carry chain. You could provide an arbitrary 3-operand truth table (8 bits), along with optionally selecting in the carry chain. This allowed for even more interesting hybrid operations such as (A + B) AND C.

Granted, the C80 was not a standalone ALU, and is quite a bit more obscure I imagine. But, it's the first thing I thought of when you started listing some of the curious functions the 74181 offers.

May 30, 2017, 2:35:06 PM

Posted to Inside the vintage 74181 ALU chip: how it works and why it's so strange