As a kid, in the mid 70s, I recall playing with a board similar to the one depicted in the article, purchased for a few coins at a surplus store. It had rows an

As a kid, in the mid 70s, I recall playing with a board similar to the one depicted in the article, purchased for a few coins at a surplus store. It had rows and columns of small modules stacked that way which consisted of one transistor, a few diodes and a bunch of resistors. All modules pretty much the same, but much smaller, with only one transistor and a few other parts, unlike the ones showed in the article. The equivalent circuit was indeed some sort of basic logic gate. Transistors were all TO72 packaged; I can't recall the manufacturer, possibly Motorola or SGS, and showed an unknown label as they were probably high grade parts relabeled for that customer which btw I'm sure wasn't NASA since I'm in central Italy. I salvaged what I could and ditched the board, so now you know who to blame if a rare piece of computer history has been lost forever:)