IBM 28L2234 manual Extensions, Using, C\MSCDEX.EXE /DIBMCD1, M nn, 3-15

/I:n

This

parameter

enables

interrupt

sharing.

If

n =1,

interrupt

sharing

is

enabled.

If

n =0,

interrupt

sharing

is

disabled. The

default

value

is

0 .

Set

this

parameter

to

enabled

when

the

IDE

interrupt

must

be

shared

with

another

device.

For

example,

a

PS/2

9577

computer

with

IDE

could

share

interrupt

14

with

the

IBM

SCSI

Adapter

/A.

Using

Microsoft

CD-ROM

Extensions

Microsoft CD-ROM Extensions

(MSCDEX.EXE)

is

an

executable

program that works in conjunction with

the

device

driver

(IBMIDECD.SYS)

to

enable

your

computer

to

read

CDs

as

DOS-formatted

disks.

MSCDEX

is

designed

for

DOS

and

Windows.

The

CDSETUP

program

automatically

adds

an

MSCDEX

statement

to

your AUTOEXEC.BAT file. You can modify

the

default

MSCDEX

parameters

to

customize

your

installation.

This

section

explains

the

function

of

each

parameter.

A

text

editor

can

be

used

to

modify

the

MSCDEX

statement

in

your

AUTOEXEC.BAT

file.

The following is the syntax

of

the

MSCDEX.EXE

entry

in

AUTOEXEC.BAT

where

[drive:][path]MSCDEX.EXE

specifies

the

location

(drive

and

directory)

of

the

MSCDEX.EXE

file.

[drive:] [path]MSCDEX.EXE /D:device name

[/M:n] [/E] [/V] [/L:drive letter]

[/K][/S]

(Do

not

truncate

the

actual

device

driver

entry.

Place

the

complete

entry

on

one

line

in

the

AUTOEXEC.BAT

file.)

Use

the

following

options

to

configure

the

device

driver.

/D:device

name

This parameter specifies the name

of

the

CD-ROM

drive

(eight

characters

maximum).

This

name must

be

identical

to

the

device

name

specified

in

the

device

driver

in

the

CONFIG.SYS

file.

For example:

C:\MSCDEX.EXE /D:IBMCD1

You

might

support

multiple

CD-ROM

drives

(of

different

types)

by

installing

each

of

their

device

drivers

(naming

them different

names)

and

placing

a

/D:

device name

in

the

MSCDEX

line

for

each

drive.

For

example,

if

you

wanted

to

support

an

IBM

IDE

CD-ROM drive and an

IBM SCSI CD-ROM

drive,

your

CONFIG.SYS

file

might

have

these

statements:

DEVICE=C:\IBMIDECD.SYS /D:IDE_CD

DEVICE=C:\IBMCDROM.SYS /D:SCSI_CD

and your AUTOEXEC.BAT file could include this statement:

C:\MSCDEX /D:IDE_CD /D:SCSI_CD

/M: nn

This

parameter

specifies

the

number of

sector

buffers

for

temporary

storage

of

the

most

recent

CD

data. For

example,

to

specify

12

sector

buffers

you

would

use:

C:\MSCDEX.EXE /D:IBMCD1

/M:12

The

CDSETUP

program

sets

this

value

to

10.

The

default

value

for

MSCDEX

with no

/M

parameter

is

4.

You

can

improve

CD-ROM

drive

performance

when

you

use

larger

default

values.

However,

each

buffer

uses

about

2 KB

of

Part 3:

Appendixes

3-15