During this period, many observers expected that UNIX, with its portability, rich capabilities, and support from companies like DEC and IBM, was likely to become an industry-standard operating system for microcomputers. Citing its much smaller software library and installed base than that of MS-DOS and the IBM PC, others expected that customers would prefer personal computers on local area networks to Unix multiuser systems. Microsoft planned to make Xenix MS-DOS's multiuser successor; by 1983 a Xenix-based Altos 586 with 512 KB RAM and 10 MB hard drive cost . "BYTE" reported that the Altos "under moderate load approaches DEC VAX performance for most tasks that a user would normally invoke", while other computers from Sun and MASSCOMP were much more expensive but equaled the VAX. The magazine added that both PC/IX and Venix on the IBM PC outperformed Venix on the PDP-11/23. uNETix, a commercial microcomputer Unix, implemented the first Unix color windowing system.