User Guide Desktop PC Equity 386SX/16 PLUS

Using Expanded Memory Beyond 640KB
The Equity 386SX/16 PLUS comes with 2MB of random
access memory. MS-DOS and your application programs that
run under MS-DOS use the first 640KB of memory. You can
use any memory above 1MB as extended memory (up to
16MB) or expanded memory (up to 24MB).
Shadow RAM uses 128KB of the RAM available between
640KB and 1MB in your system (384KB). If you use the
shadow RAM feature, 256KB of this memory is available for
use as extended or expanded memory. If you do not use
shadow RAM, you can use all of the 384KB of RAM as
extended memory but only 256KB of it as expanded memory
(to allow room for the expanded memory page frame).
Expanded memory is required by certain programs (such as
Lotus 1-2-3) that support the Lotus/Intel/Microsoft Expanded
Memory Specification (LIM 4.0 EMS). To take advantage of
expanded memory, you need to use a memory manager to
convert the computer’s extended memory to expanded
memory. If you do not have another memory manager (such
as HIMEM), you can use the one provided on your Reference
diskette, EMM386SX.SYS. Follow the steps given below.
1. Run the SETUP program to allocate the amount of
memory you want to use as expanded memory. See “EMS
Size” in Chapter 2 for instructions.
2. Copy the file EMM386SX.SYS from your Reference
diskette to the root directory of your hard disk (or the
Startup diskette).
Enhancing System Operations 4-7