Mitsubishi Electric Apricot XEN pentium Owner's Handbook Manual page 97

Expanding the system
If a second drive is connected to the ISA IDE interface you
must ensure that one drive is configured as Master, and the
other as Slave.
DOS drivers for the CD-ROM drive are described in help files
on a diskette supplied with the drive.
SCSI drives
Cabling
Authorized upgrade kits are supplied with a suitable signal
cable. The cable should be connected between the SCSI card
and the rear of the drive.
The following illustration shows a typical routing of the cable.
SCSI CABLE
XEN OWNER'S HANDBOOK 5/21