re: Infinity UC-1800 I'm reasonably sure it's a "trainer", eg. an RCA 1802 in a box, hex keypad and switches and LED display with which to poke in "demo" toy programs. It seems to operate, inscrutably. (Here you can see I try to enter an 8080 CALL instruction to no avail) (kidding). It has an "expansion" connector available in the back. There was a leaking NiCd battery pack I clipped out and tossed, but otherwise it's complete (sans and accessories it came with). Anyone have any documentation? http://wps.com/temp/inf1.jpg and http://wps.com/temp/inf2.jpg