Data General Nova 3 pictures

I have the 1984, 1990 and 1992 AD catalogs and none of them lists the ADC-120 device. Based on the PNs that they do list I think the 120 part is far older. There's no mention of ANYTHING with a MPX part number. Have you tried contacting AD and asking them about them? BTW doesn't AD's website suck?! There's nothing on it except talk about clones of the Intel CPUs for use in PCs. Joe At 05:27 PM 9/20/02 -0400, you wrote: Through the access panel you can see a couple of Analog Devices modules. The function of the ADC-120Z I can guess, but what is the MPX8A? Comments received: J.C. Wren: I would venture that the MPX8A is a multiplexor. It probably allows switching between various inputs into the ADC. Likely it has some buffering, and is perhaps medical rated. And in looking closer at the pictures, I would venture to say that the 8 input selector on the front of the respirator control panel is what selects which channel on the mux that gets routed to the A/D. At the time, those A/Ds were *incredibly* expensive. I had a 12 bit ADC and DAC pair given to me, and they were valued around $500 at the time (1983?) Toth: The Analog Devices MPX8A is a multiplexer of some sort. I think the databook you need is the Analog Devices Module Subsystems Volume 1. I have Volume 2, but it does not cover that device.