In the vSphere client, when setting up the virtual machine, the ONLY supported configuration for the primary CDROM drive is:
Device Type: Client Device
Mode: Passthrough IDE
Virtual Device Node: IDE (0:0) CD/DVD Drive 1
This will allow you to detect the media-less virtual drive. It should not be attached to a physical CDROM drive.
You may create a secondary CDROM to attach to a physical CD/DVD drive in your server if you wish. This MUST be mapped via "add SCSI device" in VMware.
Point to the IDE/ATAPI/SATA drive in the server through the drop down menu in the vSphere client. It will then appear to the Xinuos SCO operating system as a SCSI device.
OpenServer 6 and UnixWare 7.1.4 should find the device automatically.
OpenServer 5 users must run "mkdev cdrom" and configure the SCSI device node.
You must have non-blank media in this device to auto-detect it via EDGEMENU.