Probably recycled cardboard and Christmas lights by now.
"The WOPR computer as seen in the film was a prop created in Culver City, California, by members of the International Alliance of Theatrical and Stage Employees Local 44.[2] It was designed by production designer (credited as visual consultant) Geoffrey Kirkland based on some pictures he had of early tabulating machines, and metal furniture, consoles, and cabinets used particularly in the U.S. military in the 1940s and 50s. They were adapted in drawings and concepts by art director Angelo Graham. The prop was eventually broken up for scrap after production was completed. However, a replica exists but is housed in an downtown Los Angeles industrial building at an undisclosed location.[2]"