Usagi Electric | Exploring 1950’s Computer Logic with the Bendix G-15! @UsagiElectric | Uploaded July 2023 | Updated October 2024, 1 day ago.
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:
museum.syssrc.com
Here's the Bendix G-15 Theory of Operation Manual:
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:
patreon.com/usagielectric
Also, we now have some epic shirts for sale!
my-store-11554688.creator-spring.com
Come join us on Discord and Twitter!
Discord: discord.gg/p7UsfHD
Twitter: twitter.com/UsagiElectric
Intro Music adapted from:
Artist: The Runaway Five
Title: The Shinra Shuffle
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
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:
museum.syssrc.com
Here's the Bendix G-15 Theory of Operation Manual:
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:
patreon.com/usagielectric
Also, we now have some epic shirts for sale!
my-store-11554688.creator-spring.com
Come join us on Discord and Twitter!
Discord: discord.gg/p7UsfHD
Twitter: twitter.com/UsagiElectric
Intro Music adapted from:
Artist: The Runaway Five
Title: The Shinra Shuffle
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
