Apple 640 manual CD-ROM discs and drives, CONFIG.SYS file, type REM at the beginning of the line

CD-ROM discs and drives

Your DOS-compatible Macintosh allows you to use CD-ROM discs that run on DOS and Windows.

To eject a CD-ROM disc in the PC environment, press x-Y. If the CD-ROM disc cannot be ejected (because a file is in use or the CD-ROM disc is being shared), the Macintosh beeps.

You can listen to audio CDs in either the PC environment or the Mac OS, but you cannot control the same disc from both environments. For example, if you begin listening to an audio CD while working in the PC environment and then switch to the Mac OS, you can’t adjust the CD’s volume until you return to the PC environment.

If you play an audio CD in Windows while running low-level media tools, such as PC Tools or Microsoft Anti-Virus, your system may “crash.” It is best to reduce computer activity to a minimum while using such tools.

You cannot use more than one CD-ROM drive at a time in the PC environment.

The PC sets up a drive letter (E) for a CD-ROM drive even if no drive is connected. If no CD-ROM drive is connected to your computer, you can use this drive letter and free some memory by editing the AUTOEXEC.BAT and CONFIG.SYS files.

In the AUTOEXEC.BAT file, type REM at the beginning of the line

LH C:\DOS\MSCDEX /D:CDDRVR /L:E

In the CONFIG.SYS file, type REM at the beginning of the line

DEVICE=C:\Apple\CDROM.SYS /D:CDDRVR

If you preface these commands with REM, DOS ignores them.

Operating in the PC Environment 47