I have up for auction (NO RESERVE, listed very low starting prices) all the controller boards that were removed from a 1991 FADAL VMC4020 88HS. The machine was removed from service due to mechanical issues.
Most all of the cards were upgraded in 2000 when we increased the memory to 383k. One of the Glentek axis controller cards was just replaced this year (2010).
These control cards would be a cheap backup to have on your shelf in the event of a failure. They are listed on a 10 day auction and any bidder will get a good deal. I know first hand how much these cards cost, as we had to replace the Glentek axis card recently.
I will list the link to one of the cards and from there just select sellers other auctions to see all items.
http://cgi.ebay.com/ws/eBayISAPI.dll...STRK:MESELX:IT - Fadal 1420-4A 88HS Video Control Board CNC VMC PCB-0032