IBM 28L2234 manual Enhancing performance in DOS and Windows, Server

For

more

information

on

techniques

to

conserve

conventional

memory,

refer

to

the

following

topics

in

the

documentation

that

comes with

your

operating

system:

DOS=UMB,

DOS=HIGH,UMB

(CONFIG.SYS

entry)

This

command

enables

the

use

of

upper

memory

and

loads

DOS,

MSCDEX,

and

the

IDE

CD-ROM

device

driver

in

upper

memory.

HIMEM.SYS

(CONFIG.SYS

entry)

This

is

a

device

driver

that

manages

extended

memory

(RAM

memory

above

1

MB).

Windows

automatically

loads

this

device

driver.

EMM386.EXE

(CONFIG.SYS

entry)

This

is

a

device

driver

that

allows the extended memory made

available

by

HIMEM.SYS

to

be

used

as

expanded

memory.

The

MSCDEX

/E

parameter

might

be

used

in

conjunction

with this

device

driver

to

move

the

cache

allocated by MSCDEX into this

memory,

thus

freeing some

conventional

memory.

MEM

/C

/P

(use

from

DOS

prompt)

This

is

a

useful

DOS

utility

that

will

display

the

current memory

allocation

in

your

computer

to

help

you

understand

where

device

drivers

and

programs

are

located.

To

display

the

MEM

parameters

available,

at

the

DOS

prompt

type

mem/?

Enhancing performance in DOS and Windows

The following two procedures can enhance CD-ROM drive performance.

1. Allocate more MSCDEX cache (see /M parameter for MSCDEX).

2. Allow SMARTDRV to cache CD-ROM accesses.

The

CDSETUP

program

disables

the

cache

CD-ROM

data

function.

Multisession

CDs

are

not

compatible

with

the

SMARTDRV

caching

method.

If

you

do

not

plan

to

use

PhotoCD or multiple-session

CDs,

you

can

enable

caching

by

removing

the

/U

parameter

from

the

SMARTDRV

line

in

your

AUTOEXEC.BAT

or CONFIG.SYS

file.

This

might improve

the

performance

of

some

CD-ROM

applications.

You

must

have

SMARTDRV

5.0

or

later

to

cache

CD-ROM

data.

Updating

the

device

driver

for

a

DOS

network

server

If

you

are

using

the

CD-ReWritable

drive

in

a

DOS

Network

server

you

need

to

make

the

following

changes:

1.Add the /S parameter to the MSCDEX line in the AUTOEXEC.BAT file.

2.

Verify

that

the

MSCDEX line is

located

after

the

line

that loads

the

network

services

(NET

START

for

IBM

PC

LAN

program).

3.

Do

one

of

the

following,

depending

on

your

operating

system:

If

you

are

using

DOS

3.3,

be

sure

you

havePC

Local

Area

Network

(LAN)

Program

Corrective

Service

Diskette

level

IP00755

or

later

installed.

Part 3: Appendixes 3-17