These boards came from a Texas Instruments Explorer II, a rare 1980s Lisp Machine workstation used for developing and running artificial-intelligence software.

Vintage Texas Instruments Explorer II Lisp Machine circuit board lot — five boards total.

Includes:

• Explorer II “Cricket Processor” board — ASSY 2540830-0001 / PWB 2540831-0001 / SCHEM 2540832

• Large TI memory board — PSSY 2236645-0001 / SCHEM 2236647

• PWB 2243911-0001 (D)

• ASSY 2236040-0001 / SCHEM 2236042 C

• One additional Explorer II board

I came across these and they looked too interesting and unusual to send off as scrap, so I held onto them. I would really like them to end up with the right person—someone who can restore, study, preserve, or appreciate this unusual piece of early computing history.

NOTE: THE HANDWRITTEN STICKERS in the photos are my own reference labels only, used to match each board across the photos. They are NOT Texas Instruments part numbers or factory labels.

IMPORTANT: ALL FIVE BOARDS ARE UNTESTED. They are being sold strictly AS-IS, FOR PARTS OR REPAIR, RESTORATION, RESEARCH, DISPLAY, OR COLLECTION. NO RETURNS ACCEPTED. No testing equipment or original system is available, and no functional guarantee is made. Please examine every photo carefully. Cosmetic condition varies from very good to fair, with oxidation/residue present on certain boards.

Only the five boards shown are included.

If you would like additional photos, please send me a message and include the handwritten reference number shown in the listing photos, so I know exactly which board you are asking about.