 It sold for £4,500 and included the ARM processor, 4 MB of RAM and a set of development tools with an enhanced version of BBC BASIC.This system did not include the three support chips—VIDC, MEMC, and IOC—which were later to form part of the Archimedes system.They made their first appearance in the A500 second processor, which was used internally within Acorn as a development platform, and had a similar form-factor to the ARM development system.