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Project, Acorn had committed to deliver a business upgrade for the BBC Micro, with Z80-based computers running the CP/M operating system being the established business platform at that time and thus the likely form of any such upgrade. This upgrade was eventually delivered in 1984 as the Z80 Second Processor, requiring a BBC Micro, dual floppy drives and a display to complete a basic business system for a total cost of around £1500. As such, the bundle was not offered as a single, packaged business computer product, unlike a widening range of

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