Very, VERY rare! This is a blank interface adapter for NCR Decision Mate 5 (DM-5/DM-V) computers. These units are for people who want to create and program their own I/F for various purposes. This unit comes equipped with a 96-pin connector that plugs into the back of the DM-5 computer. The item pictured above is brand-new NOS, and has never been used or opened. The pictures taken of the internal circuit board were taken from an identical unit that had been opened in the past. The sealed unit pictured above is the exact same unit that you will receive. This would make a great addition to anyone's collection or museum. These blank units are extremely rare even as used interfaces. Again, this is a virgin NOS unit in its original packaging, and with its original paperwork. My late father worked for NCR for over 40 years, and was part of the original DM-5 development team. Most of these units were used by NCR's engineers to build, develop, and test prototype units for the DM-5. This unit will be responsibly packed in a sturdy box, protected from moisture, and will arrive exactly as shown in the above photos.
FREE USPS PRIORITY SHIPPING! (U.S. ONLY)
On an ending note, I am still going through my late father's collection of vintage NCR computer stuff. If there is anything in particular that you are trying to find, please let me know and I will be happy to check on it for you.
Also feel free to check out my other listings, as I am constantly adding more vintage computer items (in addition to what I already sell), as I continue to go through my dad's collection.