Using Windows 3.1 with COMPAQ's HIMEM.EXE

• Microsoft Windows operating system versions 3.1, 3.11

SUMMARY

Microsoft Windows version 3.1's Setup automatically replaces earlier versions of HIMEM.SYS or HIMEM.EXE with the version supplied with Windows 3.1, regardless of whether they were from Microsoft or another company. Windows 3.1's HIMEM.SYS is version 3.07, and supports the Lotus/Intel/Microsoft/AST eXtended Memory Specification version 3.0.

In general, HIMEM.SYS from Microsoft is completely compatible with the HIMEM.EXE supplied by COMPAQ. Microsoft HIMEM.SYS version 3.07 includes all functionality found in COMPAQ HIMEM.EXE versions through 3.02 (which was the version available at the time Windows was released).

However, COMPAQ will eventually ship a HIMEM.EXE version 3.03 which will have one additional function not found in Microsoft HIMEM.SYS. This is the ability to handle more than 16 MB of memory on an ISA machine. (Existing versions of HIMEM.SYS will only support more than 16 MB of memory on EISA or MCA machines.) This feature will be turned off by default and must be explicitly enabled to be used. If you need this functionality, then you should continue to use the COMPAQ HIMEM.EXE version 3.03.

The products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.