When you add up the facts, no other micro equals ours It's another advert for British Olivetti's M20 - in this case the entry-level dual-floppy M20 CQ, available for £2,064 - about [[2064|1984]] in [[now]]. The M20 - first released in 1982 - was unusually based on Zilog's Z8000 processor and had its own custom operating system called PCOS. This meant it wasn't IBM-PC compatible and so it suffered from a lack of software, although Olivetti did supply the basics itself: Word Processing, Spreadsheet, Financial Planning and graphics. Towards the end of 1983, Olivetti had launched a £200 8086 co-processor card for the M20, which finally gave it MS-DOS and CP-M/86 compatibility. It filled an important gap as the M20 had previously been considered to be "out on a limb"[source: "Olivetti comes in from the cold", Practical Computing, October 1983, p. 21].