link: http://www.ebay.com/itm/272480218774 Fully tested/working. This board is unusual in that it's a Z80 board that uses an Intel 8224 clock generator IC -- intended for the 8080. Not necessary to the Z80, but apparently Ithaca was trying to maximize compatibility with old S-100 boards that were expecting an 8080. As with all Z80 boards, it's not 100% compatible with every old S-100 card out there: it would not work with my DaJen SCI due to issues with how the SCI generates the "E" signal for the 6850 ACIA. Tested with an IMSAI front panel, 32K static RAM, and a Cromemco 4FDC floppy controller/console board. Onboard EPROM and power-on-jump functionality tested. Original ceramic Z80 had some broken pins that were intermittent, it will be included in the sale *if* you request it. Thanks, Jonathan