Shulou(Shulou.com)06/03 Report--

This article introduces the knowledge of "what are the common ways to release conventional memory". In the operation of practical cases, many people will encounter this dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

First, when the system is configured with extended memory, most of the code of DOS and the temporary memory part of Command.com can be installed in the high memory area (HMA). This requires the following commands to be included in the config.sys:

Device=Himem.sys

Dos=high

Although Himem.sys itself takes up a small amount of regular memory, using HMA will save us more regular memory.

Second, simplify the contents of config.sys and autoexec.bat files, do not start those unnecessary memory resident programs, these memory resident programs often occupy a lot of conventional memory.

If the config.sys file contains device commands that install smartdrv.exe or ramdrive.sys, you can cancel them to save regular memory. In particular, smartdrv.exe uses a lot of regular memory. If you must use ramdrive.sys, make sure that the RAM disk is built in extended memory, not in regular memory.

If the config.sys file contains the buffers command, reduce the number of disk buffers specified by buffers, each of which takes up 532 bytes of regular memory. However, too much reduction of the number of disk buffers will cause some programs not to run normally, and the general buffers should not be less than 15.

If the config.sys file contains the lastdriver command, cancel the command or set lastdriver to J or K instead of Z. Because DOS establishes a corresponding management block CDS in memory for each logical drive that allows access, each CDS consumes approximately more than 80 bytes of regular memory.

The order of the device and devicehigh commands in the config.sys file is very important, which will affect the efficient use of memory and the correct running of a series of programs when config.sys starts. It is best to install the device drivers in the following order in the config.sys file:

1 Himem.sys

2 device drivers that use extended memory

3 emm386.exe, if you use emm386 simulation to expand memory and provide access to high memory blocks (UMBs)

Yes, then the EMM386 command line should include the RAM switch instead of NOEMS. NOEMS forbids emm386.exe simulation

Expand memory, but it provides the largest available high memory block for installing device drivers and running other programs.

4 use a device driver with expanded memory

5 device drivers that use high memory blocks (UMBs).

For autoexec.bat, our advice is to get rid of memory resident programs that users don't need; if you only use the mouse in Windows, do not install any mouse device drivers, such as mouse.com, because Windows has a built-in mouse device driver.

Install device drivers and run other memory resident programs in the high-end memory area (UMB) as much as possible.

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