IBM 37L1388 Software, Below, There, Attempts Load, This Essential, Loads This, Available, Memory

Conserving

DOS

conventional

memory

If

the

CD-ROM

support

software

is

loaded

in

DOS

conventional

memory

(below 640

KB

RAM),

there

might

be

insufficient

memory

to

run

some

DOS

applications.

The

CDSETUP program

attempts

to

load

the

IDE

CD-ROM

device

driver

and

MSCDEX

into

upper

memory,

when

possible,

to

avoid

this

problem.

See

the

following

topics

in

your

DOS

user's

guide

for

more

information

on

techniques

to

conserve

conventional

memory:

DOS=UMB,

DOS=HIGH,UMB

(CONFIG.SYS

entry)

This loads DOS high and

enables

the

use

of

upper

memory.

This

is

essential

to

effectively load 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

Following

are

two

ways

to

enhance

CD-ROM

performance

on

your

computer

when

using

the

CD-ROM

drive

with

DOS

or

Windows:

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

2. Allow SMARTDRV to cache CD-ROM accesses.

The

CDSETUP

utility disables

the cache

CD-ROM

data

function.

Multi-session

CDs

are

not compatible

with

the

SMARTDRV

caching

method. If

you do

not

plan

to

use

PhotoCD

or multi-session

CDs,

you

can reenable 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

higher

to

cache

CD-ROM

data.

Part 3: Appendixes 3-5