Epson 4SLC2-50 - Manual (Page 59)

The interfaces for the VIDEO, PRINTER, and COM 1 ports are located
on the back of the computer. The interfaces for the COM 2, LINE,
and EXT KB ports are located on the left side of the computer. To
access any of these ports, open the port cover by pulling down on
the notch at the top.
Connecting an External Monitor
The VIDEO port on your computer allows you to connect an
external color or monochrome VGA monitor. When a monitor is
connected, you can display text and graphics on both the LCD
screen and the monitor. You can also display higher-resolution
video modes on the external monitor.
Follow these steps to connect a monitor
1. Make sure both the computer and the monitor are turned off.
4-2 Connecting Optional Devices