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Devicehigh--Notes

Using the dos=umb command

To use the devicehigh command, you must also include the dos=umb command in your CONFIG.NT or equivalent startup 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 about the umb switch, see the dos command.

Installing HIMEM.SYS

Before you can load a device driver into the upper memory area, you must use the device command to install the HIMEM.SYS device driver. This command must appear before any devicehigh command in your CONFIG.NT or equivalent startup file.

Specifying a size limit

If the device driver you specify on the devicehigh command line attempts to allocate more buffer space than is available in a block of the upper memory area, your system may lock up. You can try using the hexsize parameter to avoid this problem. In hexsize, indicate, in hexadecimal format, the amount of memory the device driver needs. To find this value for a particular device driver, load the driver into conventional memory and use the mem /debug command. This method is usually, but not always, effective.

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, the MS-DOS subsystem will load it into conventional memory (as if you had used the device command).

More Information About Devicehigh

ntcmds00000001.gif Devicehigh

ntcmds00000001.gif Devicehigh--Examples

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