An add on card that gives more and faster io and processing ability to an pdp11 as far as im aware.
Listed at its original price.

There are no guarantees this works, has all the chips required to run or that you will find or be capable of producing software to run it properly. You will get the item in the photos only.

Looks like one of the z80a's may have been replaced as i think the black chip is one, although the smaller z80a ctc doesnt seem too far of a date code to be original.

Found this in static shielded bag. Handled, stored and shipped using correct static safe methods, (not wrapped in aluminium foil).

If you want you can save on postage by meeting me at a bank of my choice where you can pay in cash only.
Otherwise it will be sent by appropriately insured mail in robust packaging.