Index | Examples | Syntax CONFIG.SYS Commands



DEVICEHIGH--Notes

Using the DOS=UMB command To use the DEVICEHIGH command, you must also include the DOS=UMB command in your CONFIG.SYS file. If you do not specify this command, all device drivers are loaded into conventional memory, as if you had used the DEVICE command. For more information, see the <DOS> command. Using MemMaker to optimize upper memory area automatically The MemMaker program, included with MS-DOS, automatically optimizes your system's memory. MemMaker surveys the upper memory area, analyzes the memory use of your drivers and programs, and determines which drivers and programs fit best into the available UMBs. MemMaker then changes selected DEVICE commands in your CONFIG.SYS file to DEVICEHIGH commands and adds /L and /S switches as necessary. For more information about using MemMaker to optimize your computer's memory, see "Making More Memory Available" in the MS-DOS User's Guide. Using MS-DOS 5 DEVICEHIGH syntax The version of DEVICEHIGH provided with MS-DOS 5 used the following syntax: DEVICEHIGH SIZE=hexsize [drive:][path] filename [dd-parameters] Although the MS-DOS 5 DEVICEHIGH syntax will still work with MS-DOS 6.22, it is strongly recommended that you use the current DEVICEHIGH syntax whenever possible. Installing HIMEM.SYS and a UMB provider To load a device driver into the upper memory area, your computer must have extended memory. You must use the DEVICE command once to install the HIMEM.SYS device driver and then again to install an upper-memory-block (UMB) provider. These commands must appear before the DEVICEHIGH command in your CONFIG.SYS file. If your computer has an 80386 or 80486 processor, you can use EMM386.EXE as the UMB provider. If your computer has a different processor, you must supply a different UMB provider. If no upper memory area is available If there is not enough upper memory area available to load the device driver you specified with the DEVICEHIGH command, MS-DOS will load it into conventional memory (as if you had used the DEVICE command).
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