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One other difference: Xenix 2.3.2 did not have a block buffer cache. Every version of SCO Unixs I've used did. Consequence: On an IBM PS/2 model 80 (?, 20 MHz 386, Micro Channel) the max throughput to the hard drive was 35 KB/s. On an AST Research 486 with a DPT SmartCache SCSI controller (high end for 1992!) we maxed out at 45 KB/s.


Using SCO UNIX describes the history of XENIX and SCO UNIX and provides a brief summary of the technical differences. As Raffzahn explains, SCO UNIX is the successor to XENIX. XENIX is a licensed version of UNIX; it was called XENIX because initially, AT&T didn’t allow its licensees to use the UNIX trademark. This was relaxed in 1989, which allowed SCO ...


What exactly were the technical advantages that made their Unix worth more than Xenix? For most parts: The Name. Otherwise it's simply the next release of SCO's unixoide OS. They were only sold in parallel for a short time (ca 1989/90). While the latest Xenix version was based on System V R2.3, SCO Unix started out as System V R3.2. But using the same ...


The shrinkwrap issue was a vicious circle perceived by the computer industry in the late 1980s to early 1990s. In essence: With many different processors and binary formats, it was difficult for a commercial “killer app” to gain enough market share to bring users to Unix; Without the strong commercial user and software base, there was little incentive to ...

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