CD-ROM Drivers CD-ROM Drivers MS-DOS and Windows 3.x (CD-ROM's for Windows are installed via MS-DOS but may have a Windows Setup available) In order to use a CD-ROM Drive, your computer must first have a CD-ROM software driver installed. This is usually supplied with the drive but may not necessarily have been installed. The CD-ROM software driver is normally supplied on a floppy disk and includes a SETUP or INSTALL program. Following installation, the CD-ROM software driver is normally loaded at system startup time via a series of entries in the machine's C: CONFIG.SYS & C: AUTOEXEC.BAT files. For example: [config.sys] DEVICE=C: DOS HIMEM.SYS DEVICEHIGH=C: DOS oakcdrom.sys /D:mscd001 LASTDRIVE=F [autoexec.bat] LH C: DOS MSCDEX.EXE /D:mscd001 /l:D The first /D: switch is the drive number, which must be the same in both config.sys and autoexec.bat.
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In the above example its ' /D:mscd001'. (If you had 2 drives fitted the second may be /D:mscd002) The /l:D switch sets a drive letter for your CD-ROM. (In this case Drive D: ) You can make this anything you want after your Hard Drives that is not taken, but make sure you put a 'LASTDRIVE=' line at the end of config.sys to allow for enough environmental space. This can be made as the letter after your last drive in use (i.e. =F) as each letter used, uses a small piece of available environment.