PC-UX
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PC-UX was a NEC port of UNIX System III for their APC III personal computer. It had extensive graphics capability. PC-UX and MS-DOS could reside on the same hard drive. It also had file transfer utilities that allowed files between PC-UX and MS-DOS. There was the PC-UX Softcard which allowed extremely high performance, reliability and memory utilization. PC-UX also used a hierarchical file structure.