I have worked out a design for using an LCD display in the 531xx counters. Basically it's a replacement front panel board with a micro and graphical LCD. I'm probably not going to build it until my VFD goes bad... maybe by then OLED displays will have their lifetime flaws worked out... current ones degrade much faster the VFDs... even if they are not powered on. Oh, and another quirk of the 53132A... the frequency reference output can be a bit distorted. On mine the duty cycle is off by around 1.25% ------------------- > They all will eventually die as the las of the VFD displays wear out. At that point, hopefully we all will be running them via serial or GPIB and not even notice the issue.