LOFTER-网易轻博

ERROR:Unable to control A20 line!XMS Driver not installed.
Warning:the high memory area (HMA) is not available.
Additional low memory (below 640K) will be used instead.
此报错原因是因为部分新机的CPU不能被CPU（A20）地址识别，高位内存不能被使用。UMBPCI.SYS和高位内存himem.sys是现在大部分网克软件调用的内存程序，而这个UMBPCI和HIMEM不能用在这些A20报错的机器上。

dell的售后联系，给我个方法，

According to Microsoft, “The A20 line is the start of the first 64K of extended memory, known as the high memory area (HMA). The HIMEM.SYS device driver must control the A20 line to manage extended memory. The HIMEM.SYS driver reports the error if it incorrectly identifies the extended memory handling mechanism of the computer or if the handling method of the computer's BIOS is unknown.”
The workaround that has been shown to be successful on the systems is to add the “/M:1” switch to the HIMEM.SYS line in the CONFIG.SYS file. Some example DOS commands are as follows.
DOS

DEVICE=C:\DOS\HIMEM.SYS /M:1

Windows 98 boot disk

DEVICE=C:\WINDOWS\HIMEM.SYS /M:1

The “/M:” or “/MACHINE:” switch tells HIMEM.SYS what machine type it is using to handle high memory from the A20 line. While the “/M:1” switch code has been successful in addressing this issue on the systems, other systems may require different /M codes. Microsoft indicates that the codes that are most likely to work are /M:1, /M:11, /M:12, and /M:13. If the wrong code is used, HIMEM.SYS may not load properly, or the system may hang and you may need to try another switch.

***SOLUTION***

Please assist your customer with using the correct /M code as a workaround for the HIMEM.SYS error encountered during the imaging process.