Semigraphics (graphic characters only) emulation for Coco 3.
Store the following values for each of the Semigraphics modes to $FF9C16 / 6543610:
| Semigraphics Mode | Vertical Scroll Register ($FF9C16 / 6543610) Value |
|---|---|
| SG6 | 7 |
| SG8 | 8 |
| SG12 | 9 |
| SG24 | 10 |
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