More house cleaning. I dug out a model EM-180B Z-80 Diagnostic/Emulator made by Applied MicroSystems. It appears to be developement system for Z-80s. It says has 64K of RAM. It has a RS-232 port and a socket for a target EPROM. It also has a hex keybaord and keys for setting breakpoints, memory addresses, I/O address, (data) Store, examine, decrement and increment, single step, run, etc. The LED display shows the adress and data and the various CPU status bits and the machine cycle states. It powers up but the 1 and 3 keys no longer spring back like they should. It's about 12" square and 4" high and runs on 110 VAC. I know nothing else about this thing. If anyone wants it contact me directly. Joe