Board #1: http://www.ebay.com/itm/272879702807 Board #2: http://www.ebay.com/itm/272879706168 I'm guessing both of these boards were used in the previous owner's Altair 8800 until they had RAM failures, and were likely replaced with something newer and less power-hungry. These are one of Processor Tech's earlier S-100 boards, and they use 32x low-power (for the time!) 2102 static RAMs. Both boards have been repaired and fully tested in my IMSAI 8080 with a 2 MHz 8080 CPU board. The first one is fully socketed and had five dead SRAMs. The second is not socketed and had one dead SRAM, which was replaced with a machine pin socket. The second one used soldered jumpers for address selection, so I switched it over to machine pin sockets for easy re-addressing. I'd suggest that these boards not be purchased by someone wanting a static RAM board for general debugging -- they're low-density, I don't believe they support the *PHANTOM line, 2102s aren't the world's most reliable SRAM, etc. They'd go nicely with an original Altair 8800 (especially if you have a CUTS system!) or SOL-20. Thanks, Jonathan