🚀 go-pugleaf

The addition of the 68881 to a 3-50 is really easy. It requires only that
the circuit board be removed from the chassis by removing the 4 allen head
screws and flipping the card extractors outward. ( Use common sense with
regard to static discharge precautions. )

On the board there is a square outline pin-grid array socket marked
"68881". In this you plug in a Motorola MC68881RC16A or MC68881RC16B,
which an Oct. '88 price list shows Qty 1-4 @ $171.  Be sure to provide
some support under the socket when plugging in the chip to avoid excessive
strain on the adjacent circuitry. You can expect that it will take quite a
few pounds of force to seat the chip in the socket. There are no config
switches or jumpers.

For your info, there is also an empty socket for HW support of DES using,
I think, an Intel chip.