For example, if CRTC R2=46, and CRTC HSYNC width is 14 chars then monitor hsync starts at 48 and lasts only until 51 included.
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The On CRTC VSYNC, the Gate Array (or ASIC) will always output black for 26 lines (, including 4 lines of C-VSYNC to the monitor), . This is true even if the duration of the CRTC VSYNC is reduced to 2 µseconds.
The Gate Array uses 2 internal counters to create its CSYNC signal: