Adaptec supply install instructions for this card. Unfortunately, depending on the SCSI devices that you have installed in your system, the card may not work with all of your devices if you follow the instructions supplied by Adaptec.
The install instructions supplied by Adaptec for this card read as follows:
Following these instructions enables support for the SCSI card but may not give you access to some of your SCSI devices. The reason is that some SCSI devices (but not all) also require that the OS2SCSI.DMD driver (that comes with OS/2) also be loaded before they will work.
If you installed SCSI support when you first loaded your operating system then this driver should already be loaded (look for a BASEDEV=OS2SCSI.DMD line in your CONFIG.SYS to check). If you have added the card after completing your OS/2 install, then you may need to load this driver. Adaptec do not supply instructions on how to do this. I would have thought that the fact that their card doesn't always work properly without it would be reason enough for them to do so, but they don't think so.
So what's the easiest way to install this driver. Well, its not stored in a useable form on the OS/2 install CD so we can't just do a straightforward install of the driver from there.
The simplest way that I found is to ignore the instructions from Adaptec and do the following instead:
This SCSI card works really well with OS/2 once you get both of the drivers installed so it would be a real shame if you gave up on it because you haven't installed all of the drivers that you need to get it to work properly.
This article written by Stephen Chapman, Felgall Pty Ltd.