== HSYNC and VSYNC ==
The HSYNC and VSYNC signals from the CRTC are passed to the [[Gate Array]] for further modification. See its wiki page.
The HSYNC width value is interpreted differently between CRTCs. On CRTCs 0/1, if 0 is programmed no HSYNC is generated. On CRTCs 2/3/4, if 0 is programmed this gives a HSYNC width of 16.
CRTCs 1/2 have a fixed VSYNC width value of 16. VSYNC width can be configured with R3 on CRTCs 0/3/4. If 0 is programmed this gives 16 lines of VSYNC.
The HSYNC and VSYNC signals from the CRTC are passed to the [[Gate Array]] for further modification. See its wiki page.
Even if the number of lines of VSYNC is set to 1 in R3, the Gate Array (or ASIC) will output black for 26 lines, including 4 lines of C-VSYNC to the monitor. This is also true if the duration of the CRTC VSYNC is reduced to 2 µseconds.