🚀 go-pugleaf

In article <21JAN199313503538@elroy.uh.edu>, elee969@elroy.uh.edu (Brown,
William J.) writes:
|>
|>After loading the network (DECNET pathworks 4.0), Stacker, etc., I have
|>only about 350k of conventional memory left, not enough to run MS's
|>programmer's workbench.  I've heard of people using QEMM386 to free up
|>generous amounts of memory.  Can anybody give me comments on how QEMM386
|>works and what sort of improvement I should expect.
|>
QEMM386 replaces HIMEM and EMM386 as memory manager.  It assumes you have some
unused space in your PC's Upper Memory to load various and sundry drivers and
TSRs "high".  Note that HIMEM and EMM386 are included with DOS 5.0.

Using HIMEM and EMM386, DOS provides a pair of commands, DEVICEHIGH, and 
LOADHIGH.  These prefix existing commands in Config.Sys and Autoexec.Bat such
that when the program is loaded, the system tries to put it in unused Upper
Memory space.  When I use PATHWORKS 4.1, Stacker 2.0, DOS 5.0, and EMM386 and
HIMEM, I have 536k free of Conventional Memory.

DEVICEHIGH/LOADHIGH are relatively(?) dumb.  They appear to use a first-fit
algorithm to load programs into the Upper Memory holes.  QEMM386 (and 386^MAX)
have enough sense to record how big the various holes are, how much memory
each of the drivers and TSRs need, and then controls into which hole each one
is placed (best-fit).  This inevitably provides a nice additional savings of
Conventional Memory.

If you have DOS 5, try using HIMEM and EMM386 first.  If you have Windows 3.1,
check around your disk for the most recent files.  If you still don't have
enough conventional, get one of the third-party commercial managers.

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Sheldon E. Smith			!Email:
Digital Equipment Corporation		! ssmith%ncdel.enet.dec@decwrl.dec.com
Minneapolis, Minnesota			! ...!decwrl!ncdel.enet.dec.com!ssmith
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