Anyone have any practice on this? I am trying to interface the Fluke to the old Gottlieb System 1 CPU, which uses +5 and -12 MOS logic...goal is simple RAM, ROM testing on board without having to unsolder those !@#$!@# spider IC's. NS has a device for TTL->MOS Translation that should handle the Address and Control lines, but the DATA path is a bit trickier. 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.