Article View: comp.sys.ibm.pc.misc
Article #432Re: Do I need a memory manager?
From: Christian Blum
Date: Thu, 30 Jul 1992 12:59
Date: Thu, 30 Jul 1992 12:59
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It really depends on what you're doing. If you run applications that use EMS or you want to have an UMB (upper memory bank, located between graphics card and BIOS), you'll need EMM386 (or QEMM386 5.0, I strongly suggest). If you run programs that make use of XMS only, HIMEM.SYS will do fine. There is another point on memory managers: they put the processor in the virtual V86 mode. This means: the processor emulates an 8086 with extended instruction set. It's really an emulation: interrupts don't work. EMM386 and QEMM solve this by emulating the interrupts, too, so they really are software-called by the manager if HE (the manager, god of your system) is triggered by one himself. All those emulations slow down your system. Performance can decrease by 10 percent or so... BTW: some programs don't work with the V86 mode. E.g. DKBtrace, Windows (except for win /r), ... Chris
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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!Germany.EU.net!unido!sbsvax!coli-gate.coli.uni-sb.de!sbustd!chbl From: chbl@sbustd.rz.uni-sb.de (Christian Blum) Newsgroups: comp.sys.ibm.pc.misc Subject: Re: Do I need a memory manager? Message-ID: <1992Jul30.125957.16619@coli.uni-sb.de> Date: 30 Jul 92 12:59:57 GMT References: <1992Jul23.140503.1448@qucis.queensu.ca> Sender: news@coli.uni-sb.de (Usenet news system) Organization: Studenten-Mail, Rechenzentrum Universitaet des Saarlandes Lines: 20