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DevelopmentSega Master System / Mark III / Game Gear |
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Game Gear LCD
General Description
| Manufacturer | Citizen |
|---|---|
| Model | UC-320 |
| Screen Size | 3.2" |
| Resolution | 160 X 146 dots |
| Display Type | Super-Twisted Nematic Colour LCD |
| Backlight | Cold-Cathode Fluorescent Lamp |
| Sega Part | 390-5311 |
SMS Mode Scaling
Also see forum topic.
Horizontal Scaling
256 pixels wide is reduced to 160 pixels by removing the first 8 and last 8 columns to make the width 240 pixels, then mapping three source pixels to two pixels of the display using sub-pixel mapping.
[RGB]1 [RGB]2 [RGB]3 = [RG1B2] [R2GB3]
Vertical Scaling
Vertical scaling is achieved by not incrementing the Y value at every third row, additionally, a duplicate pixel is rendered at Y + 1 for each third pixel in the sequence.
192 Line Mode
The 192 lines are padded with 13 rows of border color at the top and 13 at the bottom to give 218 lines total before the image is scaled down to fit the 146 lines of the display, this results in a letterboxed image.
224 Line Mode
In 224 line mode, 3 rows are removed from the top and 3 from the bottom to give 218 lines that are scaled to fit the 146 lines of the display, this gives a full-screen image.
240 Line Mode
Not supported. Setting this mode will freeze the display until the Game Gear is power cycled.
