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- When the system register setting value changes
- The timing when the system register setting value becomes valid is as follows.
- Change immediately
Plot trigger mode (when PTM, 01B is written)
TV mode selection (TVM)
- Changes every field (1/60 second)
Frame buffer switching mode (FCM)
Frame buffer switching trigger (FCT)
- Things switched by frame buffer switching
Plot trigger mode (when PTM, 00B or 10B is written)
Even / odd coordinate selection bit (EOS)
Double dense interlace enabled (DIE)
Double dense interlace drawing line (DIL)
Erase light data
Erase light coordinates (upper left, lower right)
- Change after one line display after V blank IN interrupt
V Blank Erase Write Permission (VBE)
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