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The Bendix G-20 was a a general-purpose mainframe computer, introduced in 1961 by the Bendix Corporation, Computer Division, Los Angeles, California. It was constructed of transistorized modules and magnetic-core memory. Word size was 32 bits, plus parity. Up to 32k words of memory could be used. Single- and double-precision floating-point arithmetic were allowed, as well as a custom scaled format, called Pick-a-Point. A special form of the pick-a-point allowed an integer.
Please visit Bendix on Bitsavers for more detailed information.
A kind viewer, Hugh, came across these boards from someone who was clearing out and making space. According to them, back when they were in highschool (I think 70s-ish given his age), the electronics class was given an old computer from the United States Geological Station to salvage parts and help students learn electronics. The teacher teacher had the students disassemble the whole computer for parts, but by the end of the week, there were so many boards and parts, they just let the students take home leftover boards.
Alas, that is often the story with the old mainframes that became outdated, but thankfully, Hugh was able to save a handful of boards! After some chatting about them, Hugh was kind enough to send them my way for inspection and hopefully reverse engineering.