Computer Building (574)
Built: 1961
Decommissioned: 2002
The Computer Building was well positioned within the Pyestock site. Believed built in 1961
(along with the Air House and Cell 3) it was placed
almost equidistant from the major testing cells (Cells 1 & 2,
Cell 3 and the then future Cell 4). This minimised
the amount of data and control wiring required between each cell and the computer.
Given the size of the building and the size of early computers, the Computer Building was probably
designed to house only one machine. The first computer was believed to be a first-generation valve based
Atlas (and the engineers had to change approximately a dozen valves a day to keep it going).
It was later joined by an Elliot 803B machine.
In 1963/64, the ageing Atlas was replaced by the second-generation (and probably far more reliable)
solid-state SDS9300. As the decade continued, it was joined by a
DEC PDP-7 (SN#41) and
then a DEC PDP11/20 in the mid 1970s.
These machines would've required specialised environmentally controlled rooms. The interior of the Computer Building
still reflects this requirement, with two large, windowless rooms situated in the middle of the
building, one on each floor. These were surrounded by corridors with offices and workshops on the periphery.
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The north and west sides of the Computer Building. 05|05|07 © Simon Cornwell 2007
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One of the more novel features was a tunnel leading from a trapdoor in the Computer Building to the
underground passage connecting Cell 3 and Cell 4.
Named Monks Tunnel (the nomenclature determined by a
warning board placed near the trap door) this passage was probably used to route data and control cabling
from the computer through to the cells.
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South eastern view across the Cell 3 control room. 05|05|07 © Simon Cornwell 2007
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It appears the exterior of the building was altered in the 1980s with smart brick cladding, new window
frames, new staircases and a pitched roof. New offices extended the west of the building but weren't
added at the same height thus creating a mezzanine floor. This remodelling was prompted by the arrival of the
microcomputer, so there was no need for a purpose built computer building. This rebuilding also involved
the repositioning of Cell 3's control room, which was moved into the
empty first floor computer room. (And required the addition of more cabling distributed through Monks Tunnel.)
Despite the removal of the huge mainframe and minis, the Computer Building never really lost its connection
with computers. Now closed and standing largely empty, we found one ground floor office full of redundant
PCs and monitors, all awaiting their fate. And despite lacking the architectural massiveness of the test cells,
the Computer Building was built to a more human scale, and offered some wonderful views of the huge
buildings and piping networks which it one controlled.
Computer Building Walkthrough...
Further Reading
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