UNETix

uNETix was an early implementation of UNIX for IBM PC systems. It was not a true UNIX: it was written from scratch for the PC without using any code from System V. It supported a single user, yet kept closer compatibility with standard UNIX than early versions of QNX, and its support for up to ten windows, each running an independent task with its own foreground and background colors, was possibly the first windowing in a Unix-like operating system. Published by Lantech Systems with a 1984 list price of 130 US dollars, it needed 256 KB of RAM for single tasking and 512 KB for multitasking, and could run DOS 1.1 programs in one window through an emulation environment. Its major weaknesses were slow speed and a lack of hard disk support.