Rockwell Automation 1784-KTS Troubleshooting Guide download pdf (Page 13)

Before using this document  5

MS-DOS

Microsoft supplies three files that manage memory usage in your computer with

MS-DOS.

 EMM386.EXE

 HIMEM.SYS

 SMARTDRV.SYS

EMM386.EXE

EMM386.EXE is a type of extended memory manager program provided with

MS-DOS. In the CONFIG.SYS file, the command line that loads EMM386.EXE

can be modified to avoid conflicts with DH485 and DH+ compatible cards.

1. Use the exclude statement with EMM386.EXE to specify which address to

avoid. The command line below avoids an A-B 1784-KT communication card

with a memory address of D800.

DEVICE=C:\DOS\EMM386.EXE EXCLUDE=D800-DBFF

2. Use the MEMMAKER utility to assist you in allocating memory if you are not

using 386MAX or QEMM. MEMMAKER makes more conventional memory

available by loading some device drivers and memory-resident programs into

the upper memory area.

TIP

MEMMAKER can be too aggressive and cause communications

problems. Apply this utility with caution.

HIMEM.SYS

The MS-DOS operating system includes the extended memory manager program

HIMEM.SYS. HIMEM.SYS is necessary for EMM386.EXE to function.

SMARTDRV.SYS

The SMARTDRV.SYS is a disk-caching program designed to decrease the amount

of time the operating system takes to read data from the hard drive. The

SMARTDrive program needs the HIMEM.SYS extended memory manager.

Consult your MS-DOS documentation for more details.

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Rockwell Automation 1784-KTS Troubleshooting Guide Page 13