No. 6: Installed Non-IBM SCSI CD-ROM under DOS and cannot access it
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Assumed, you installed an IBM SCSI-Adapter or used the one in your machine (card or onboard) to connect a SCSI CD-ROM drive to it. The adapter is recognized in the setup and so is the CD-ROM drive. But you cannot access it. What's wrong ? 

Do the following: 

get the SCSI CD-ROM Driver Disk SCSICDRM.EXE from IBM ftp 
extract it to a 720K / 3.5" disk 
run the UINSTALL-program from the disk to install the device-driver IBMCDROM.SYS 
use a Text-Editor to add /i in your CONFIG.SYS at the end of the line with the IBMCDROM.SYS 
If you have a CD-ROM (like some NEC) and it refuses to work even after adding the /i try to add a /P:2 as well to enable the read seek command on this unit too. (Thanks White Box !) 
restart the system 
This little /i will convince the IBMCDROM.SYS to accept all CD-ROM drives, which do not have the !x-sign in their device descriptor and therefore are recognized as Non-IBM devices.
Works fine with NEC, Toshiba, Panasonic, Sony etc.
BTW.: It pays to read the README-file on the SCSICDRM-disk ... 

Pretty easy, right ? 


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