/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

Page 43
Image 43
IBM 28L2234 Interrupt, Sharing, Default, Set This, Disks, For, Text Editor, Statement, File Following is the syntax, Entry