Pictures: http://imgur.com/a/Y5IcG These boards came from a piece of scientific gear I picked up in an equipment lot at a local auction. Turns out the chassis is almost S-100! The cards are exactly the same size (one picture shows a card inserted in the card guides in my Altair 8800B), have the power supply rails in the right places, and use the right connector. The chassis they were in was a 22-slot OEM chassis with a linear supply, but there was no CPU board; instead, everything was controlled through a GPIB interface board. These cards are very high quality FR4 boards with hard gold plated edge connectors. Interesting design -- I don't know if the card was too complex for a two-layer board or what, but they laid out a bunch of IC footprints, then staked wire wrap sockets in at each pad. Wire wrap pins are fully gold plated. Pictures provide a better explanation. All boards have regulator + heatsink, two card ejectors, several tabs on the top edge for connectors, and a mix of 14, 16, 20, and 24 pin DIPs. The boards are as-removed, so you'll be unwrapping a bunch of connections to use them. DIPs are mostly a mix of 74HCT random logic, with a bunch of LS7061 32 bit/dual 16 bit counters (PDF datasheet available online). Price as follows: Board as-is with all chips: $40 USD I keep the chips: $30 USD IDC connectors for top tabs: $1 each, snipped off, will come with a bit of cable Shipping: $15 USD in the US, will ship international but I'll need your address for a price I have eight of these. Thanks, Jonathan