Unix (3.2v4.2) and ODT FAQ

This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.

How much RAM can my older SCO Unix system use?

This depends on your OS version:

  • 3.2.0: 16 MB
  • 3.2v2.0: 256 MB
  • 3.2v4.x: 512 MB if you use a mem= bootstring; 256 MB if not
  • 3.2v5.0.0, 3.2v5.0.2: 768 MB using a mem= bootstring; 512 MB otherwise. You can also add the Large System Supplement (V1.0.0 for 5.0.0; V1.0.1 or 1.1.0 for 5.0.2) which enables support for up to 2 GB
  • 3.2v5.0.4: 4 GB right out of the box

5.0.4's support for more than half a gig of memory is more stable than 5.0.2 or 5.0.0 with the LSS; if you require this much memory, you should seriously consider upgrading to 5.0.4.

You can find details on the mem= bootstring in your man page for boot(HW); the quick summary is that

: defbootstr mem=1m-768m

will instruct the system to scan for 768 MB of RAM. Do not specify more memory than the maximum for your release.

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