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From: orenalex@bimacs.BITNET (oren alex)
Newsgroups: comp.os.msdos.misc,comp.os.msdos.programmer
Subject: Re: IBM & MS DOS 5.0 - loadhigh on ATs
Message-ID: <3109@bimacs.BITNET>
Date: 24 Mar 91 16:23:19 GMT
References: <91078.145407CES8@psuvm.psu.edu> <RICHARD.91Mar20164814@alpha.iesd.auc.dk>
Reply-To: orenalex@bimacs.UUCP (oren alex)
Organization: Bar-Ilan University, Israel.
Lines: 49

In article <RICHARD.91Mar20164814@alpha.iesd.auc.dk> richard@iesd.auc.dk (Richard Flamsholt S0rensen) writes:
>
>  I've tried a beta version of the new DOS (MSDOS 500.409e I think...)
>because I'd heard, that it could load device drivers and TSRs high
>even on 286-based ATs. My machine is a two year old AT with 384Kb of
>plain extended RAM (no shadow, chip&techologies, NEAT or whatever).
>
>  I tried so (using "loadhigh <program>"), and it didn't complain
>(i.e. no "Machine too old for this trick" error message or the like),
>but it didn't load anything high: a look at the memory using MAPMEM
>revealed, that it had been put into low DOS memory (both device
>drivers and TSRs).
>
>  I've permuted the device driver lines in my config.sys quite heavily
>and don't think there's any combination I haven't tried. Currently, it
>reads
>       device = c:\dos\dos500\himem.sys
>       dos = high
>       [other devices, shell, break, etc ... nothing using extended RAM]
>
>  My question is: does anybody know, if this "you can load drivers and
>TSRs high also on 286 ATs"-tale belongs in alt.folklore.urban or, if
>not, what I should do to make it behave?
>

OK, by "loading high" dos 5 means two different things
1) the "dos=high" in config.sys tells dos to load in the HMA (High Mem
   Area) which is the first 64K-16 bytes after 1M.
   works on 2/3/4-86 if you have an XMS device driver.
   use device=himem.sys or better yet - QEMM.
2) using the "loadhigh" command (can be abbreviated as "lh") assumes
   that the address range between 640K and 1M contains system RAM and
   so - programs can be loaded there into "Upper Mem Blocks".
   This is true if you have mapped some extended RAM into that area
   trivial on 3/4-86 which have internal support for this but cannot
   be done on a 286 (at least without external support).
   if you have the hardware - use dos={high/low},UMB in your
   config.sys, you must use an EMS driver so add device=emm386.exe
   or better yet - QEMM.
   viola: you may use loadhigh... and devicehigh=...

Hope it helps,
        Alex.