Reverse-engineering an IBM Mainframe Vacuum Tube Pluggable Module

In this episode, we get our hands on a pluggable module out of an IBM vacuum tube computer. IBM used these awesome modules that could be pulled out as a unit, and each module consisted of some type of circuit. For example, some were cathode follower buffers, some were dual inverters, and so on. I’m not really sure what this one is, so today, we’re going to see if we can’t figure out how it works!

Thanks for watching!

Wiring diagram: https://i.postimg.cc/R02jHFm3/Wiring.jpg
Schematic: https://i.postimg.cc/cHYPMS1F/Schematic.jpg

IBM 604 Engineering Manual: http://www.bitsavers.org/pdf/ibm/604/227-7609-0_604_CE_man_1958.pdf
IBM 650 Engineering Manual: http://www.bitsavers.org/pdf/ibm/650/22-6284-1_650_CE_Manual_of_Instruction.pdf
Computer picture 1: https://commons.wikimedia.org/wiki/File:IBM_150_Extra_Engineers_1951.jpg
Computer picture 2: https://commons.wikimedia.org/wiki/File:Ordenador_IBM650_1959_MUNCYT.jpg
Pluggable module picture 1: https://commons.wikimedia.org/wiki/File:RoehreIBM_090325.jpg
Pluggable module picture 2: https://commons.wikimedia.org/wiki/File:IBM_700_logic_module.jpg
Music: Suco de Melancia by Red Tailed Fox - https://ocremix.org/remix/OCR01671

Видео Reverse-engineering an IBM Mainframe Vacuum Tube Pluggable Module канала Usagi Electric