Check the listing for details. HP 10529 60017 Universal Reference Card 10529A Logic Comparator Blank PCB DIY. Condition: New. Listed at 22.00 USD. I am selling my last Blank PCB to build your own Universal Reference Card for the HP Logic Comparator 10529A. As I am sure you are aware the original HP Universal Boards show up very infrequently and fetch alot of money. With this Blank PCB you can build your own board which has a ZIFF socket and dip switches so you can set it to test any TTL logic you want to test rather than Use the classic hand drill individual boards. Follow these forum threads online for documentation and Bill of Materials to build this board. Get them while supplies last. PHOTOS show the original Universal Comparator card for comparison. You are purchasing the BLANK PCB only!http://www.gauck.com/arcade/HP10529a/https://forums.arcade-museum.com/threads/the-hp-10529a-thread.274541/page-25