Vsync Correction

Overview

This section only covers VSync Frequency: Original mode.

Although the UpserGrafx outputs a 720p signal, the signal isn't fully synchronized due to design constraints. As a result, a horizontal line may appear on the screen after using the UperGrafx continuously for a while. The signal can be fine tuned so that this line won't appear.

The UperGrafx and the PC Engine each have an internal crystal oscillator that need to be calibrated individually to improve timing accuracy. The timing can vary based on the crystal oscillator's individual characteristics and environment (primarily related to temperature).

Things to Check Prior to Calibration

  • In the settings menu, change the side area design to grid type.
  • Set the vsync frequency to original.
  • Make sure a small horizontal yellow line appears in the center of the left side of the screen.

This line represents the vsync synchronization border. If it moves too fast, it indicates that calibration is necessary. This line will also appear in 60.00Hz mode, but it will be moving around much too fast.

Calibration Instructions

  • Connect the UperGrafx to a PC via a USB cable.
  • Navigate to the settings menu from the PC Engine's list menu (*1).
  • Leave both the UperGrafx and PC Engine running for about 20 minutes so they reach a stable operating temperature.
  • Open the UperGrafx control panel, navigate to misc, and click on the calibration start option. The calibration takes about 15 seconds.
  • Check to see if the calibration was successful, and if there are no issues, power on the system and run a game.
*1: If you calibrate it without warming up, the calibration will be inaccurate.

Things to Check After Calibration

Once the yellow line shows little to no movement, the signal has been correctly calibrated.

The line will temporarily be placed in the center of the screen during calibration to make it easier to judge its movement.

How to Get Rid of the Line that Appears After an Hour has Passed

Unfortunately, you will need to reset the video signal via one of the following two methods:
  • Unplug the system and plug it back in.
  • Unplug the video cable and plug it back in (or you can also quickly switch to a different input on your TV and change it back, or turn your TV off and on again).
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