Product Support Bulletin
Subject:
Using the EEMM386.EXE Device Driver
Date: 6/12/89
Page:
1
of 1
PSB No:
S - 0
Originator: M
The purpose of this bulletin is to explain the installation and usage of the
EEMM386.EXE device driver on the Equity 386/20.
The Equity 386/20 can be configured with up to 16MB (155MB user
accessible) of 32 - bit RAM.
This is normally treated by the system as
extended or linear memory.
This can be used by a specific device driver
(such as VDISK.SYS) or by an appropriate operating system - MS OS/2 or
Xenix, for example.
MS - DOS and MS - DOS applications cannot make direct
use of this type of memory.
Some MS- DOS applications can take advantage of expanded memory
specification (EMS) RAM.
This is a memory paging specification developed
jointly by Lotus, Intel and Microsoft and is commonly referred to as LIM spec
memory. The current specification is 4.0.
Epson provides the device driver EEMM386.EXE with the Equity 386/20 that
takes extended memory and emulates LIM EMS memory.
It is installed at
boot- up via a line in the CONFIG.SYS file. The proper syntax is:
DEVICE = C:\EEMM386.EXE nnnn
where nnnn is the amount of memory in kilobytes to be reserved for EMS
emulation. As the system boots and installs the device driver, a message is
displayed on the screen while each page (16KB) of memory is tested. Once
installed, virtually any MS - DOS application that utilizes EMS memory can be
loaded and will access the additional RAM.
Only one application tested to date has shown anomalous behavior -
Microsoft Windows 286. When loaded, it does not recognize the existence of
EMS memory. This is due to its extremely strict compliance with the LIM 4.0
specification.
However, when an application such as Lotus 1 - 2 - 3 or Excel
is loaded from Windows 286, these applications do detect and use the EMS
memory. Note that windows/386 does not experience this behavior as it uses
extended memory and performs its own EMS memory mapping.
