"Advanced Micro Computers Inc Microprocessor Development System 29/05" It is a multibus CP/M system for development of 2900 microcode. There were cards available for downloading of microcode to a target system, and a microassembler. docs under http://bitsavers.org/pdf/amd/amsys29 I have a bunch of docs scanned for this system, and the software. You're the first person I've heard about coming across one of these in a long time.