System Hangs with Adaptec 2740/2742 Controller with CDROM Attached

System hangs with Adaptec 2740/2742 controller with cdrom attached
Last updated: 11 Feb 1995

DESCRIPTION OF SYMPTOMS
Attempting to access a CDROM attached to an Adaptec 2740/2742 scsi controller causes trap or system hang.

SUMMARY OF RESOLUTION
Disable tagged queing for the AIC7770.ADD driver.

DETAILS OF RESOLUTION
1. Edit the OS2 config.sys file.

2. Change the line BASEDEV=AIC7770.ADD to BASEDEV=AIC7770.ADD /A:0 /TAG:1

3. Shut down system and then reboot for change to take effect.

Source
ftp://software.watson.ibm.com/pub/os2/info/ah274x.txt