Adaptec PC/104 - Manual (Page 23)

Chapter 2 Hardware Installation 17
adapter BIOS is enable , you should assign a right BIOS address (JP8
and JP9) and port address (JP7) at the same time.
Host Adapter BIOS Disabled = Open
Host Adapter BIOS Enabled* = Close
(* means default setting)
SCSI Hard Disk Drive Connector (CN1)
The SCSI hard disk drives require a 50-pin flat cable. Wire number 1 on
the cable is red or blue, and the others wires are gray.
1. Connect one end of the cable to CN1. Make sure that the red (or
blue) wire corresponds to pin 1 on the connector, which is labeled on
the board .
2. Plug the other end of the cable into the SCSI device, with pin 1 on
the cable corresponds to pin 1 on the drive.