People, I recently bought a Tektronix Microlab I on eBay. It was sold as is, and in fact does not work. If anybody wants to take a stab at fixing it, you can have it. It is some kind of combination trainer/emulator. It has RS-232 and audio in/out to be used by the monitor program for loading programs into RAM. It looks like a microprocessor trainer: hex keypad, LED display, buttons for stepping through and starting and stopping the program. It can support a variety of different processors via personality cards. The card that is in there is for the TI TMS9900. Good luck finding other personality cards. They definitely were produced. When it is powered up, it shows different things on the LED and never responds to user input. I have made no effort at further diagnosis. Who knows, it might just be a power supply problem (linear, I think). It comes with complete documentation on microfiche including schematics. If somebody is interested in fixing it, it's free. -kurt