I was collecting all of my hex LED displays into one place so I can test them before embarking on a new 1802 project. I even dug into my old box of spare Elf parts and pulled out a small board with four TIL311 displays attached to a small microcontroller board - some kind of monitor/indicator given to me by the brother of the guy that got me into the 1802 as a kid. He had given it to me to harvest the TIL displays. I finally *looked* at the attached board to see what was on it - an NS 8073! I used to have access to an RB5X robot when I was a volunteer at the local science museum in High School - same chip - the hot-item-for-a-brief-moment microcontroller with embedded Tiny Basic. Now, rather than harvest the parts, I'm very tempted to reverse-engineer the schematic of the little board to see what it does. Looks like there's a small bipolar PROM, a 6116 SRAM, one or two TTL chips, and the TIL311s driven by the output pins of the 8073. The whole thing is only a few square inches. The funny thing is that I'd recently picked up a few 8073s from ePay to play with. I was planning on hooking them up to some 8031-based 8-line LCD displays I got for a few bucks each (originally out of some flavor of AT&T office phone, IIRC). Sort of the Classic Attraction principle in reverse - new toys attracting alike items Has anyone else played with the 8073 (in an RB5X or not)? If they hadn't been so pricey 20 years ago, I might have gotten one to experiment with back then. -ethan The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com