"Micropolis MZOS", actually "MZ OS", or "MZ Operating System", is a disk-based and booted operating system for computer systems built around the Zilog Z80 CPU. Unlike Micropolis MDOS, MZOS is not a Micropolis product but was developed by Vector Graphic Inc., an early, late 1970s computer manufacturer. As part of a co-operation, Vector Graphic embedded Micropolis floppy drives and controllers OEM into their "MZ" computer. As many older Vector customers were previously using Northstar controllers and Shugart drives on previous Vector computer models, the need for data migration to the newer hardware arose and from it the need for a binary compatible OS. MZOS was then developed by Vector Graphic employee Neale Brassell in 1978 and allowed users to copy data disk to disk when both, a Norhtstar disk setup and Micropolis drive and controller combo, was present in a system. This was beneficial as Micropolis drives and disks offered more capacity and users could not only migrate existing data but also merge multiple disks into one. Despite Micropolis MZOS sometimes being referred to as "Micropolis MZOS", the MZ prefix in fact comes from the OS being designed for the "MZ" computer and MZOS was a product solely designed by Vector Graphic.