That's an interesting ad, but a bit ironic given Intel's later Pentium floating point division bug. On the topic of using calculator chips as coprocessors, Nat

That's an interesting ad, but a bit ironic given Intel's later Pentium floating point division bug. On the topic of using calculator chips as coprocessors, National Semiconductor introduced the MM57109 Number Cruncher Unit (that is the real name) in 1977. It was essentially a repackaged 12-digit scientific calculator chip, operating on binary-coded decimal values with values entered in Reverse Polish Notation. This chip was absurdly slow; a tangent, for instance, could take over a second. http://www.projects.scorchingbay.nz/dokuwiki/_media/electronic/datasheet/national/an-186_mm57109_interface_to_microprocessor.pdf http://www.projects.scorchingbay.nz/dokuwiki/_media/electron...