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Open the back door. 2. Unscrew 3 screws and remove the Riser card bracket kit. 3. Secure 2 screws to fix the CD-ROM PCB board. Hardware Installation 13 PC 6170 User’s Manual 4. Put the CD-ROM in the drive bracket and fix it by 6 screws. 14 Hardware Installation PC 6170 User’s Manual 2.5 3 x Serial Ports The PC 6170 provides three onboard serial ports installed on the back bottom side of the chassis. For systems, COM1 and COM2 are RS- 232 and COM4 is RS-232/422/485. Each serial port is with +5V/+