Exploring 1950’s Computer Logic with the Bendix G-15!

We’re back on the Bendix baby! In today’s episode, I want to take a look at all the unique logic cards in the system, but before we get that far, we gotta get our clean on. Hop along as we take every single card out of the Bendix G-15, clean each one painstakingly, then repopulated the whole machine, and finally take a deep dive into what each card does. We also try to answer a pretty important question – is this an NC or an ANC machine? Check out System Source here: https://museum.syssrc.com/ Here's the Bendix G-15 Theory of Operation Manual: http://www.bitsavers.org/pdf/bendix/g-15/60121600_G15_Theory_Of_Operation_Nov64.pdf If you want to support the channel please hop over to Patreon: https://www.patreon.com/usagielectric Also, we now have some epic shirts for sale! https://my-store-11554688.creator-spring.com Come join us on Discord and Twitter! Discord: https://discord.gg/p7UsfHD Twitter: https://twitter.com/UsagiElectric Intro Music adapted from: Artist: The Runaway Five Title: The Shinra Shuffle https://ocremix.org/remix/OCR01847 Thanks for watching! Chapters 0:00 Working on the Big Blue Beautiful Behemoth 1:00 The game plan 3:25 Taking every card out 5:58 If you’ve got time to lean, you’ve got time to clean 7:56 Door latches and modifications 9:18 Putting it all back together 11:04 D2 “Diode 2” module 11:56 Card edges and replacement diodes 12:48 D1 “Diode 1” module 13:35 D3 “Diode 3” module 14:20 The BI and FF cards 15:36 BI “Buffer Inverter” module 16:39 FF “Flip Flop” module 17:12 And aside about diode clamping 18:05 DC “Diode Clamp” module 18:35 CC “Clock Clamp” module 19:42 CF1 “Cathode Follower 1” module 20:54 CF3 “Cathode Follower 3” module 21:23 CF2 “Cathode Follower 2” module 21:54 RA “Read Amplifier” module 22:44 WA “Write Amplifier” module 23:42 RC “Read Clock” module 24:44 Alphanumeric (ANC) vs. Numeric (NC) 28:44 Scouring schematics for the answer 32:49 What did we learn? 34:57 Happy kitty! Here are all the modifications: Blue B3T - C7K C8K - K5P C7N - A54P C7V - C8V - A54A K34J - Loose wire B54P - Two white wires that disappear into loom Red C7C - E48R C7P - F51P C7R - B36F D16D - C54R D16E - D35V D16F - J15B D16S - D17R - E14B D17E - A28T B41k - K47V (Broken connection) B41V - H50P Yellow K7D - D30S