Wat is DPMI - Overige hardware

maandag 4 december 2000 11:08

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#Boots2Asses

Topicstarter

Hebben jullie wel eens gezien dat er tegenwoordig DPMI en ESCD wordt gecheckt voor je OS wordt gestart? Over de ESCD heb ik inmiddels wel wat gevonden, wat het precies is weet ik ook niet, maar mijn Win98 gaat lopen zeuren over de DPMI, maar waar heeft ie het dan over???

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ABIT KT7, THUNDERBIRD 800, 128 MB SDRAM 100 Mhz, PIONEER DVD 105S, Plextor 12X10X32A.
Alleen doet m'n bakkie het nog even niet
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Soms, als ik heel stil ben, kan ik de zon horen schijnen

maandag 4 december 2000 11:11

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Verwijderd

DOS Protected Mode Interface

DPMI (DOS Protected Mode Interface) is a program interface that allows an application program running under the Disk Operating System (DOS) to take advantage of a DOS extender, which lets the program address a larger range of random access memory (random access memory) than the 640 kilobytes to which PC programs are basically constrained. To use the extender, the program must be in "protected mode," a mode that ensures that program requests are not allowed to access certain portions of "protected" memory. (Programs running in the alternative "real mode" have access to all portions of memory, including system data.)
The first widely-distributed operating system for personal computers, DOS was designed to run on the Intel 8088 microprocessor. The 8088 provided a megabyte of RAM that could be addressed by a program instruction (that is, the total span of storage for storing and getting data back and forth between the microprocessor and RAM was a million bytes). Because certain space had to be reserved for "system" use (keeping track of applications, system status, and so forth), only 640 kilobytes was available for an application program. These bytes were contiguous in storage (that is, continuously adjacent to each other and not divided into different parts of RAM) and application programs were required to run and keep their data within this 640 kilobyte space. In fact, an instruction that violated the 640 kilobyte space would not be executed (thus protecting the system space in RAM). A program that ran in "real mode" could address the entire 1 megabyte of RAM including system data, but at the risk of writing data to the wrong place.

As new microprocessors such as the 80286 followed the 8088, DOS continued to preserve the 640 kilobyte addressing limitation so that newly-written application programs could continue to run on both the old as well as new microprocessors. The DOS extender program allowed application programs written for DOS to be freed from the 640K constraint by inserting memory management code into the application. Microsoft developed the DPMI for use on Windows 3.0 (which was itself a DOS application) and later gave the standard to an industry organization, the DPMI Committee.

Today's personal computers, using microprocessors that succeeded the 8088, typically contain eight or more megabytes of RAM. Today's operating systems (including the latest DOS versions) come with extended memory management that frees the programmer from the original addressing constraints.

Besides the DPMI standard interface, two other standard extended memory management interfaces exist. Extended Memory Specification (XMS) is a program added to more recent versions of DOS and Windows when the system is loaded. It's called HIMEM.SYS. Another extended memory manager is the Virtual Control Program Interface (VCPI).

DPMI

maandag 4 december 2000 11:12

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_JGC_

DPMI is Dynamic Protected Mode Interface of zoiets? Is een of andere geheugenstandaard net zoals XMS en EMS. Windows geeft dit soort uit aan DOS-apps.

Wat jij bedoelt is de DMI pool waar ie inkijkt (checking DMI pool data...)
Hierin wordt de status van je mobobijgehouden (temperatuur, evt fouten, etc)
ESCD is de Extended System Configuration Data, dit is waar alle PnP instellingen liggen opgeslagen. Normaal moet dit alleen komen als je met de IRQ's gerommeld hebt, of een kaart hebt verplaatst. Windows heeft niets te maken met dat verhaal. Dat komt van de BIOS.

Zo hopenlijk een beetje duidelijk