CDC Cyber 960 – Welcome to cray-cyber.org

960 Foam removed

Our 960 covered the room with small pieces of sticky foam. Oli and I removed the acoustic foam from the hood. Now we still have to clean the 960 and our room.
Here are some impressions of the work.

960_hood_outside — 960 Hood, melted foam

Dieses Bild hat ein leeres Alt-Attribut. Der Dateiname ist IMG_20181127_191708_960_hood_foam-768x1024.jpg

Cray-Cyber at the German magazine Chip.

We are proud to be represented with the Computermuseum München in the 40th anniversary issue of Chip. Over 6 pages you can learn more about us and our Cyber 960. We would like to thank the Chip for making this possible. More of the magazine chip under www.chip.de, at chip-kiosk.de you can buy it.

Anniversary edition of the chip magazine

Our Cyber 960

Some problems in communication IOU / main memory

We does some tests and find one stuck bit in communication between IOU and memory. Measured the communication channel with modern Lecroy scope.

Cyber 960 first run without any errors

All variable transformers had to be cleaned, now the power supply is stable again. We tested the currents through the transformers and diodes with the clamp ammeter.

A short video @youtube about the Cyber 960, you can hear the 400Hz and the fans.

Fan repair at the console CC545, we disassembled the engine and greased the bearings. Now we know that a second fan is installed, because the first one is now quiet.

CDC Cyber 960 starts after 8 years

The installation of the cables is completed, now we start troubleshooting.

Many thanks to Jerry, he sent us a new IOU to CPU cable.

Our Cyber CC545 console urgently needed thorough cleaning. The picture tube works at 17500V so we don’t take any risks. The housing has also been repaired.

The IOU transformer had contact problems, we disassembled it and cleaned all contacts and surfaces.

The CDC Cyber 960 is alive, we can access the IOU, but the dead start fails.

Stay tuned!

Working on the CDC960 and reading the backup tape for the CRAY Y-MP EL

A lot has happened in the last few weeks:

For the operation of the CDC 960 almost all devices are installed in our computer room.
The power distributor is rebuilt and equipped with new fuses, as well as the 400Hz cable from the generator and the 50Hz supply line within our room is laid and connected.
The 400Hz generator has been successfully tested.
Also from the Cray Y-MP EL there is something pleasing to report, we could read the urgently needed SCAN files from a defective original tape.

Here are some impressions:

CDC405, CDC960