Using MS-DOS 5.0 or later EMM386.EXE on Altima NSX (77182)

The information in this article applies to:
    Microsoft MS-DOS operating system 5.0
    Microsoft MS-DOS operating system 5.0a
    Microsoft MS-DOS operating system 6.0
    Microsoft MS-DOS operating system 6.2
    Microsoft MS-DOS operating system 6.21
    Microsoft MS-DOS operating system 6.22

This article was previously published under Q77182


If you are trying to use the MS-DOS 5.0, 6.0, or 6.2 EMM386.EXE device driver on an Altima NSX 80386SX computer, the following message may be displayed:

EMM386 not installed - insufficient memory
This message appears regardless of the amount of extended memory you have on your machine.


The Altima NSX computer is only available as an 80386SX system. The Altima NSX also has an 8-bit ROM that significantly reduces the system's floppy disk access time. As a result, Altima made some changes to the BIOS to compensate. The Altima NSX has an Award BIOS version 3.1.

The changes to the BIOS include dedicating 64K of extended memory for shadow ROM and 320K of extended memory for EMS (expanded memory specification). Neither of these options can be disabled or turned off. Because of the nonstandard BIOS on the Altima NSX, EMM386.EXE cannot be used on these machines regardless of the amount of extended memory.


The only alternative is to use a third-party memory manager. According to Altima, Quarterdeck's QEMM can be used to successfully manage the upper memory area.

MS-DOS can be loaded into the high memory area (HMA) on an Altima NSX 386SX by including the following lines in the CONFIG.SYS file:
The products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Modification Type: Major Last Reviewed: 5/12/2003
Keywords: KB77182