Computers and Programming

UC Berkeley CDC 6400 Memories

"Checkmate!"
The UCB CDC 6400's last words
playing chess with Roger Johnson.

Parts removed after final shutdown in August 1982.
Click on pictures for full size.

UCB CDC6400 System Diagram
UCB CDC 6400
System Diagram
CPU/PPU Core Memory Module 4k X 12 bits
CPU / PPU Core
Memory Module
4k x 12 bits
7" x 7" x 4"
CPU/PPU Core Memory Module Reverse
CPU / PPU Core
Memory Module
4k x 12 bits

Reverse
Card Punch Core Memory
Card Punch Core Memory
2 x 40 x 12 bits
Wikipedia on Core Memory CPU/PPU Core Memory Plane
CPU / PPU Core
Memory Plane
4k x 1 bit
4" x 4"
CPU/PPU Memory Cores Close-up
CPU / PPU Memory Cores
1 bit each
0.2" x 0.2"
Card Punch Memory Cores
Card Punch Memory Cores
1 bit each
0.2" x 0.2"

Pictures of a CDC 6500
From Living Computers Museum CDC 6500  **
CDC 6500 Console Display
CDC 6500 Console Display **
CDC 6500 Chassis and Card Punch
CDC 6500 Chassis and 415 Card Punch ***
CDC 604 Tape Drive
CDC 604 Tape Drive ?
CDC 405 Card Reader
CDC 405 Card Reader **
CDC 6600 Deadstart Panel
CDC 6600 Deadstart Panel *
CDC 6500 Chassis Panel
CDC 6500 Center Chassis
CDC 6500 Far Right Panel
CDC 6500 Left Panel

* Courtesy of  Ed Thelen (http://ed-thelen.org/comp-hist/vs-cdc-6600.html)
** Courtesy of PA0GRI (http://pa0gri.ampr.org/lcm_reunion/index.html)
*** By MBlairMartin - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=50249589