Operating System: DOS (Note: might work with other versions of this os.)
For multiple devices, use several "/D " parameters in both CDROM.SYS & MSCDEX.EXE.
Only one copy of each should be loaded, the device names must match.
Using "/L " to assign a logical drive letter the first CD-ROM is recommended.
Additional devices will be assigned to succeedng letters.
"/DMA" & "/UDMA" parameters are handled by CDROM.SYS if your board has support.
Use the "/E" parameter with MSCDEX.EXE to free up more conventional memory (requires an extended memory manager).
The install program in the zip will copy the files & add lines to your AUTOEXEC.BAT & CONFIG.SYS.
It also adds a "LASTDRIVE=" to CONFIG.SYS.
You will need to edit these if you have more than one CD-ROM device.