In the late 70's I designed and produced a single board Z80 computer for my job, and I kept one for myself, and eventually used it in home automation projects. I don't need this anymore, so it wants to be adopted by somebody who wants to play with a Z80 without breaking anything expensive. Specs: approx size: 11.25 x 9 inches. double sided ceramic/gold Z80 with 2.4576 MHz crystal 6 2114 RAM installed, room for 2 more. So 3K bytes installed, upgradable to 4K bytes 2732 EPROM installed but socket designed to take bigger parts. EPROM is running a simple monitor that allows one to control the I/O ports. Footprints on the board for two more EPROMS. 2 Z80 DARTs, so 4 serial ports 1488 and 1489 RS232 line driver/rcvr installed. Three of the serial ports are brought out in DB25 connectors. 1 Z80 CTC installed, room for a 2nd one. Footprint on the board for a Z80 PIO 2 74LS374 8 bit latches for I/O installed. Footprints on the board for an analog mux and an A/D converter, both in 28 pin 600 mil wide packages. No idea what part they are. Input power should be 5v and +/- 12v (for the RS232 output) The board comes with almost no documentation, but it's a double sided board, so it should be easy-ish to reverse engineer it, especially since it's half populated and there are handwritten markings for some of the uninstalled parts. The board and I are in Jackson, NJ. I will be going to the repair workshop at the museum this weekend, though I realize this is short notice. I can ship this at your expense. Bill Dudley This email is free of malware because I run Linux.