Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!cs.utexas.edu!execu!sequoia!rpp386!jfh From: jfh@rpp386.cactus.org (John F. Haugh II) Newsgroups: comp.unix.xenix Subject: Re: total memory Message-ID: <18158@rpp386.cactus.org> Date: 19 Mar 90 05:53:02 GMT References: <2@grumbly.UUCP> <8111@tank.uchicago.edu> Reply-To: jfh@rpp386.cactus.org (John F. Haugh II) Organization: Lone Star Cafe and BBS Service Lines: 25 In article ron@mlfarm.uucp (Ronald Florence) writes: >In article <8111@tank.uchicago.edu> goer@sophist.uucp (Richard Goerwitz) writes: > > That "upper" 384 k is used by all PC's and their descendents for > > various things like the system BIOS, video memory, etc. > >The upper 384K is used by "some" PCs. This is the startup memory of >Xenix 2.3.2 on our ps2/80 with 6 mb of ram installed: > > mem: total = 6144k, reserved = 4k, kernel = 1340k, user = 4800k I used to have 2048K of memory, and POST reported there was exactly 2048K of memory, and XENIX agreed. Then I added another 2048K, and POST reported only 3712K, which is 384K shy of what one might expect. The answer, in the case of a Wyse 3216 is that the hardware can remap the 384K if you have only 2MB, but when you have more than one board it has to leave the ending address of the memory alone so the next card will start at a reasonable address. Apparently IBM did the right thing with the PS/2 and Wyse didn't. -- John F. Haugh II UUCP: ...!cs.utexas.edu!rpp386!jfh Ma Bell: (512) 832-8832 Domain: jfh@rpp386.cactus.org