The rear of the projector houses the input connections; its layout is pretty typical. From left to right starting over the power socket here is the layout: First column is the Audio In 1, 3.5mm jack (top), Audio In 2, 3.5mm jack (middle), & Audio Out 3.5mm jack (bottom). The next column features the S-connection (4-pin mini-DIN)at the top Composite video (RCA)output jack on the bottom. Column 3 features the Computer In 1 (15 pin mini D-sub) on the top and Computer In 2 (15 pin mini D-sub) at the bottom. It’s better to have 2x connections of this sort. Both allow connection to analog RGB or component cable. The next 3-colums are really single jacks. The first is the monitor (aka. Computer)out (15 pin mini D-sub). Next is the HDMI Digital connection. Although ViewSonic doesn’t include HDMI cable with this product, I felt that I achieved a better performance level using my personal PPC cable and would encourage others to at least try it. Another downer about the HDMI port is that there is only 1 and not 2, something I personally dislike. Next is the (9-pin) RS 232 jack. This is primarily for command and control. Next is the Type B (mouse control) USB connection when used with computers. Mounted below is the Mini USB display port. Second to last on the list is the LAN port (RJ45 Ethernet) connection. Lastly is the Type A USB (card reader) port.