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Update tvcon for SAIL Data Disc display
Update the protocol to accommodate the Data Disc display and SAIL keyboard.
- Different resolution: 512x480 pixels.
- Different keyboard layout.
- Updates are in scanline segments of 6 or 8 pixels.
Question: add switch to tvcon, or make separate ddcon program?
I would argue the differences are quite small, so a separate program shouldn't be needed. However, an alternative name would make sense.
If the protocol is updated, it would be good to also consider the Logo "color TV".