Expanded control software for single-die probing into multi-die probing for 2- and 4-die parallel testing. One tester acts as the master with up to 4 slaves. The master's display shows which die are tested by which slaves and records the result. The master tester alone interfaces to the prober. Debugged the master/slave tester box interface card connected to a hardware emulator for 3 slaves. The slaves used a customized analog tester that also performed complete digital functional testing with a 56001-based CPU. All Mac code was written with MacApp in Object Pascal. The master program consisted of 9 files in 6500 lines in Object Pascal. The slave Mac program consisted of 30,000 lines of code in 18 files.