Editing Acorn System 4 (section)

== Configuration ==

The minimum System 4 contained a 1 MHz 6502 CPU card, a VDU card, 16 KB of RAM and a floppy-disc controller with two drives mounted in the top half of the rack; further Eurocards could be added in the 14-slot lower frame.<ref name="wp" /><ref name="chris4">Whytehead, Chris. [https://chrisacorns.computinghistory.org.uk/Computers/System4.html "Acorn System 4"], Chris's Acorns / The Centre for Computing History. Source for the 14-slot double-height frame, the minimum configuration, and the example card set (CPU with System-keyboard connector, 8K static RAM, 40-column VDU, Econet, Universal Interface Board, Bus Extender) on a 14-slot backplane.</ref> A documented example fit includes the 6502 CPU card (with a System keyboard connector), an 8 KB static RAM card, a 40-column VDU card, an Econet card, a Universal Interface Board and a Bus Extender, on a 14-slot backplane.

In 1982 the System 4, with casing, power supply and a basic 16 KB of RAM, cost £1525, plus extra for the keyboard.<ref name="wp" />