IBM 8Xmax, User Manual

Page: 63 / 88

/T:n
This parameter specifies time delays to be built into the IDE read loop. Use
this parameter only in computers that do not support the IOCHRDY signal on
the IDE bus, and in computers that read from the IDE port faster than the
CD-ROM can provide data. This parameter is usually not required in most
computers.
n is a relative timing parameter that depends on microprocessor speed. When
the value of n increases, the drive data-transfer rate decreases. Valid values for
n are 0 through 99. The default is n=0, and the /T parameter is not required.
/I:n
This parameter enables interrupt sharing. If n=1, interrupt sharing is enabled.
If n=0, interrupt sharing is disabled. The default is n=0.
Using Microsoft CD-ROM Extensions
Microsoft CD-ROM Extensions (MSCDEX.EXE) is an executable program that works
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. Use
a text editor 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 statement in the MSCDEX line for each drive. For example, if
you want to support an IBM IDE CD-ROM drive and an IBM SCSI CD-ROM
drive, your CONFIG.SYS file would have these statements:
DEVICE=C:\IBMIDECD.SYS /D:IDE_CD
DEVICE=C:\IBMCDROM.SYS /D:SCSI_CD
Part 3: Appendixes 3-3