UP FOR AUCTION IS A VINTAGE "ISI-87 PROTOCOL CONVERTER" BY INSTRUMENTATION SERVICES. IT WAS MADE IN THE USA. THE ISI-87 CAN BE USED WITH ANY 3276 CONTROL UNIT/DISPLAY STATION OR ANY 3274 CONTROL UNIT WITH A TYPE "A" TERMINAL ADAPTER. I AM REALLY NOT SURE WHAT IT IS USED FOR. I BOUGHT IT AT AN ESTATE SALE, AND WAS ASSURED THAT IT WAS TRSTRD AND WORKS GREAT. IT HAS A POWER CORD ATTATCHED, BUT DOES NOT COME WITH ANY OTHER CORDS. IT APPEARS TO BE IN GREAT CONDITION. HEAVY DUTY. ULTRA RARE. 

I HAVE HUNDREDS OF OTHER AWESOME, VINTAGE, AND RARE COLLECTIBLE ITEMS AVAILABLE.

AWESOME AND VERY RARE. BE SURE TO CHECK OUT ALL MY OTHER COOL AND UNUSUAL STUFF. PLEASE LET ME KNOW IF YOU HAVE ANY QUESTIONS, CONCERNS, OR PROBLEMS.
Thanks for looking,
Victoria