14PPC-120/140 User's ManualWhen you turn the panel PC around and look at its rear cover, you willfind the PCI/ISA expansion slot located on the left side. This slot iscovered by a side panel cover. The sunken I/O section is at the bottom ofthe panel PC, as shown in Fig. 2-3. (The I/O section includes various I/Oports, including serial ports, parallel port, the Ethernet port, USB ports,the microphone jack, and so on.)Figure 2-3: Rear view of the panel PCPCI/ISA expansionslot coverPS/2 mouse andkeyboard connectorEthernet jackContrast adjust knobLightness adjust knobLine out jackLine in jackGame portSerial portsParallel portVGA portMicrophone in jackUSB ports