Well, I think it can be done! I was lent a Z80 version of the series 90 uP tester and the circuit to make the 8085 pod change to Z80 is not TOO horrible. I will be doing some tests this week and let you all know. There is an Eprom change (the custom ICs don't change, fortunately) and rewire. Da#@ thing has pretty tiny pins on the internal interconnect... So did anyone else buy these? John :-#)# John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) http://www.flippers.com "Old pinballers never die, they just flip out." To UNSUBSCRIBE from techtoolslist, send a message with "UNSUBSCRIBE" in the message body to: techtoolslist-request@flippers.com. Please direct other questions, comments, or problems to jrr@flippers.com.