Changes
CRTC
,/* The Internal registers of the 6845 are */
|''Register Index''||''Register Name''||''Range''||''CPC Setting''||''Notes''
|-
|0||Horizontal Total||00000000||63||Width of the screen, in characters. Should always be 63 (64 characters). 1 character == 1μs.
|-
|1||Horizontal Displayed||00000000||40||Number of characters displayed.
|-
|2||Horizontal Sync Position||00000000||46||When to start the HSync signal.
|-
|3||Horizontal and Vertical Sync Widths||VxxxHHHH||128+14||HSync pulse up to 15 characters wide, should always be more than 8; VSync bit not present on some CRTCs.
|-
|4||Vertical Total||x0000000||38||Height of the screen, in characters.
|-
|5||Vertical Total Adjust||xxx00000||0||Measured in scanlines, can be used for smooth vertical scrolling on CPC.
|-
|6||Vertical Displayed||x0000000||25||Height of displayed screen in characters.
|-
|7||Vertical Sync position||x0000000||30||When to start the VSync signal, in characters.
|-
|8||Interlace and Skew||xxxxxx00||0||00: No interlace; 01: Interlace Sync Raster Scan Mode; 10: No Interlace; 11: Interlace Sync and Video Raster Scan Mode
