OZvm is principally a hardware emulation of the Cambridge Z88 portable computer, a Z80 CPU system with 4Mb addressable memory, a monochrome 640x64 LCD, and RS-232 serial port. It allows you to install any ROM or application card binary that also runs on a real Z88 portable. OZvm is also a versatile Z80 assembler debugging environment with a command line, screen activity recording, and Z80 instruction logging. It assists the developer in testing Z80 assembler programming of the Z88 operating system or 3rd party applications.