I could give you a dozen of them (all pre '80 date code or older!). You need other parts to build a system using it. Minimally you need 8224 clock chip and a 8bit latch or 8228 to get the status signals off the buss. The rest if perpherals and memory. Others from that (pre 1980) era I have: IMSAI IMP-48 (works but, I really need a manual or schematic!!!) circa '79 If you've never seen one it's a small board with relays and opto IO for control use, tty interface, cassette IO led display and keyboard for programming(in hex!). National SC/MP 8a500 cpu(late '78) RCA1802(base cosmac elf 1979, board from the first PE article) 6502(old part) TI9900 chip on board(technico super starter system) moto 6800D1 kit('75-76) LSI-11/03 card that's a tad older them most of those (functional too). I also have a small system using the National nibbleBASIC (8070) chip in 1980. Allison