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EMM386.EXE B=<address> Explained

The information in this article applies to:
  • Microsoft MS-DOS operating system versions 6.0, 6.2, 6.21, 6.22


This article explains the following EMM386.EXE switches in greater detail than MS-DOS 6 Help does:

  • B=<address>

  • ROM=<address>


EMM386.EXE B= Switch

This switch deals with expanded memory services (EMS) 4.0 "banking." The B=<address> parameter specifies the starting low-memory address where EMS banking can occur. All memory below this address is global. All memory above this address can be remapped with EMS 4.0 calls.

There are very few software programs that take advantage of EMS banking. This feature could be useful for control programs (such as Windows 286 or real mode Windows 3.0) that run multitasking applications. These multitasking applications could load a different application into each bank and change the active bank when switching applications.

EMM386.EXE ROM= Switch

This switch instructs EMM386.EXE to shadow (in RAM) the ROM addresses you specify. This switch does not work on some Zenith BIOS chip sets.

Additional query words: 6.22 6.00 6.20

Keywords :
Version : MS-DOS:6.0,6.2,6.21,6.22
Platform : MS-DOS
Issue type :
Technology :

Last Reviewed: November 16, 1999
© 2000 Microsoft Corporation. All rights reserved. Terms of Use.

Article ID: Q98508

Last Reviewed:
November 16, 1999

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