Comment by JoeDaDude
5 hours ago
For a while I worked at what was then the Sperry Rand Corporation (now Unisys) which had some pride in their heritage as the descendant of the Univac Corporation founded by ENIAC inventors Eckert and Mauchly. In a glass case there was a vacuum tube circuit said to be a memory unit of the original ENIAC. No one seemed to know much about it, casting doubt on the claimed provenance of the device. The tube circuit resembled the ones shown in the photo linked below (although none of those in the photo are from ENIAC).
https://en.wikipedia.org/wiki/File:Women_holding_parts_of_th...
(This is a repost of an older comment I made)
If it looked like the one on the left then it was probably an ENIAC decade ring counter. It could store 1 digit from 0 to 9 and could selectively count pulses to increment the value, with carry to the next one. The 10 tubes on the right (out of 36) were the actual flip flops of the counter.