Changes
CRTC
,/* The 6845 Registers */
|2||Horizontal Sync Position ||00000000||46||When to start the HSync signal.
|-
|3||Horizontal and Vertical Sync Widths||VVVVHHHH||128+14||HSync pulse width in characters (0 means 16 only on some CRTCCRTCs), should always be more than 8; VSync width in scan-lines. (0 always means 16 on some CRTC. Not present on all CRTCs, fixed to 16 lines on these).
|-
|4||Vertical Total (-1)||x0000000||38||Height of the screen, in characters.
registers 18-31 read as 0, on type 0 and 2.
registers 18-30 read as 0 on type1, register 31 reads as 0x0ff0xff.
Details about Reg. 12 and Reg. 13 specifically:
