Assorted PCB ID?

[Cory Heisterkamp]

I found myself cleaning up the shop recently, and came across some vintage circuit boards I had stashed away 20 years ago. I’m curious if anyone can shed some light on what systems they originally went to. Here’s a link to the album…more info below.

https://photos.app.goo.gl/amRmm5P8375js4o1A <https://photos.app.goo.gl/amRmm5P8375js4o1A>


#1 Marked Aeronutronic Address Buffer D700909. Socketed transistors and test points along leading edge with ID tab visible when installed.
#2 No name or brand marking, sides have cast aluminum rails and a clever locking mechanism. Transistors are 2N-167 in clips.
#3 Marked 'Power Supply 1534 8253'  5-1-70, single-sided with edge connector.
#4 Large card 11”x10”, Burroughs logo. Date stamp of Jun 1972. Not sure if someone has robbed some of the ICs or if this was optional population.
#5 Small 3x4 card, single-sided but every hole has an unusual pressed-in and flow-soldered barrel. Relays are marked Blue Bead 26.5V. Looks early Japanese. 4 corner brackets have threads swaged-in for mounting.

Thanks,
Cory