Figure 3-3 Video Display Timing Fields - Rastergraf Eclipse3 Series User Manual

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To change the horizontal frequency:
The horizontal frequency is also known as horizontal refresh or scan rate.
Indications that the horizontal frequency needs to be changed are an
unviewable picture with diagonal lines or no picture at all. Similar
symptoms can be caused by no sync at all, so make sure that the cables are
connected. When the sync is incorrect, the number of diagonal lines is an
indication of how close to the correct horizontal frequency you are: fewer
lines are closer, more lines are farther. Changing the horizontal frequency
will also affect the vertical frequency. Decreasing the horizontal frequency
will generally result in a wider picture.
To change the horizontal position:
To shift the image left increase the horizontal front porch by the same
amount. Perform the converse procedure to move the image to the right.

Figure 3-3 Video Display Timing Fields

Horizontal Total
Horizontal Blanking End
Horizontal Retrace End
Horizontal Retrace Start
Horizontal Blanking Start
Horizontal Display End
Active Display Area
Vertical Border
Vertical Blank
Vertical Retrace
Vertical Blank
Vertical Border
Programming On-board Devices 3-15