DEC VAX 8650

The VAX 8650, code-named "Morningstar", was introduced on 4 December 1985. It was a faster version of the VAX 8600, which was a successor to the original VAX-11/780. The VAX 8600 was the last VAX to be 100% compatible with the VAX-11/780, to have the PDP-11 compatibility mode, and to use the SBI also used by the VAX-11/78x. The CPU had a 55 ns cycle time (18.18 MHz).

There are two SCSI controllers in the Unibus chasiss. The TD Systems VIK/UTO controller emulates the TMSC protocol so an attached SCSI tape drive would look like a DEC TU81 tape drive.

This system was part of a large VAX Cluster using the DEC CI interface. The the dark octagonal spot on the right door is where the Cluster device number was. This was the primary device 1 in the cluster. This disks on this system were connected through an HSC90 cluster controller in a separate cabinet. There were other smaller VAXen and large storage devices in the Cluster.

This is the I/O backplane at the far right of the cabinet. Slot 1 is at the far right.

This is the ABus between the CPU and the I/O chassis

CPU chassis

Memory chassis

BA11 Q-Bus and Unibus chassis

The Q-Bus is connected to the CSL board and is used to boot RT-11 on the T-11 processor.

The CSL board can be used to run diagnostics, load microcode into the VAX processor, and start the system boot process.

VAX 8560 Main Processor Cabinet

The VAX 8650 processor with the access covers closed. The black units at the top are power supplies.

Lots of boards to make a CPU!

Left to right: Memory, CPU, A Bus, I/O

The back of the 8650. The red warning labels tell you to take off your rings and watches before working in this area.

VAX 8650 I/O Cabinet

The RL02 10 MB disk drive is used by the PDP-11/03 service processor to load the microcode.

The box below the RL02 is the Unibus I/O expansion chassis.