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/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