Solution:

Compatibility Information : OS/2 Warp ( All versions including Warp Connect , Warp server , and Warp V4 ) Installation procedure : 1 . Type CDINST from cdrom drive to create two boot Diskettes. 2 . Remove the following files from Disk 1 . aha152x.add aha154x.add aha164x.add aha174x.add aic7770.add 3 . If you are installing ultra 2 scsi host adapter , delete the aic7870.add as well . 4 . Copy the new driver from Adaptec 7800 family Manager Set diskette for OS/2 onto OS/2 Disk 1 . 5 . Edit config.sys (In Disk 1 ) and remark out the basedev statements for all of the above deleted drivers . Ex : Rem basedev = aha152x.add 6. Add a new Basedev statement in config.sys basedev = aic78u2.add 7. Make sure the following statement in config.sys is present Set saveconnect = 1 8 . At the end of installation , aic78u2.add gets copied to the root partition of the boot drive , and the config.sys will have a corresponding Basedev statement .