This is the processor unit with its covers opened.
In the middle is an aluminium panelled gate, it opens out hinged on the right,
that is the RAM (Random Access Memory), which if I remember correctly, was 64MBytes.
To its left are power supplies. These took alternating voltage electricity
and produced low voltage (9v, 12v, ...) DC electricity.
On the right is 'The Stack' or CPU (Central Processing Unit),
and below it, its power supplies. For more about a power supplies go to
Power Supply.
The Stack was a cube in shape,
this is one side which was a
multilayered printed circuit board
that the CPU boards plugged into
on the other side.
It was a BUS that the flat red cables
connected to and connected the CPU to
the main memory and I/O channels.
To the right is aluminium panelling
of ductwork, channelling chilled air
being blown through the Stack
because it generated a LOT of heat
using emitter coupled logic.
An even closer view shows the back wiring
on the multi-layered circuit board.
More interesting are the three
black edged vertical bars on the right.
They are solid copper electricity bus-bars
carrying electricity to the CPU boards.
There are another three you can just see on the left.
Another aspect to notice is the massive
construction of the frame of the Stack
It is heavy: two people struggle to lift it,
it weighs over 100Kg.