Expanded Memory - "Can't Find WP.FIL" Error M

DocumentID: 606319
Revision Date: 29-Feb-96 1:31:41 PM

The information in this document applies to:
WordPerfect® 5.1 for DOS

Problem

Symptoms: The Western Digital MM.SYS version 4.0 expanded memory locks the computer when running WP unless you use /NE. The customer tried using these startup options: /32 /NH /NK /NC, but /NE was the only option that wouldn't give the error "Can't Find WP.FIL". BIOS is Phoenix 01/15/88. Solutions: The customer was configuring expanded memory as extended memory which will certainly cause the computer to lock up. When customers are configuring memory they should be aware of the difference between expanded and extended memory. Expanded memory (hardware speaking) is not recognized or addressed by the CPU. It is a hardware board that is plugged into the motherboard. The expanded memory manager interfaces with this board and is the communication bridge between application programs and expanded memory. Extended memory is recognized by the CPU and can be directly addressed by the CPU if the CPU is in protected mode. Programs such as QEMM, 386MAX, 386EMM put the CPU in protected mode. There are two modes that the 80286 and 80386 can run in: Real mode and Protected mode. Real mode only allows the CPU to address up to 1M of memory (DOS uses 640K). Protected mode allows the CPU to address several megabytes of memory (80286 can address 16M and a 80386 can address 32M). For an expanded memory manager to use extended memory as expanded memory it must put the CPU in protected mode.

Answer:

Details:

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