Check the listing for details. VINTAGE PCB BOARD EXCELLON PHOTONICS RD13618 20-BIT TRACE PROCESSOR MM1620J45. Listed at 279.00 USD. MO VINTAGE PCB BOARD EXCELLON PHOTONICS RD13618 20-BIT TRACE PROCESSOR W/MM1620J45 LAST ONE NICE WALL-HANGING! AS PER PHOTOS OFFERED AS-I (TYS-301) BUYING VINTAGE COLLECTIBLES: Many items are very difficult to test so minimal testing is done- I rely on where the item comes from and my knowledge of what good condition is. Your item may not be perfect and it is part of my personal collection over the past 50 years. I am selling everything as I am age-challenged at 79. Some items may require technical knowledge to repair or operate properly. We offer these hard-to-find items in AS-IS condition. Please do not buy this item if these conditions are unacceptable. I have been involved in the PC industry since day one and will try to respond to any questions you may have and Thanks for the Memories, DAVID FREEMAN (Huge Thanks for all of you that supported ACP Superstore)