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CRTC

194 bytes removed, 3 July
/* HSYNC and VSYNC */
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.
 
During an HSYNC, if HSYNC width is changed with a value less than the current HSC, then HSC is overflowing. The only exception is for CRTC 1 with a value of 0, which cancels the current HSYNC.
CRTCs 1/2 have a fixed VSYNC width value of 16. VSYNC width can be configured with Register 3 on CRTCs 0/3/4. If 0 is programmed this gives 16 lines of VSYNC.
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