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Acorn AKA01 A300 backplane (front)
Acorn AKA01 A300 backplane (back)
Unlike the A400 series, the Archimedes A305 and A310 did not have a podule backplane installed when they shipped. This is Acorns backplane upgrade which was required before podules could be installed. Other companies also produced backplanes for the Archimedes A300.
The instructions for installing a backplane are in the Backplane installation leaflet in the documents section.