Changes
CRTC
,/* The 6845 Registers */
|7||Vertical Sync Position||x0000000||30||When to start the VSync signal, in characters.
|-
|8||Interlace and Skew||CCDDxxII||0||CC: Cursor Skew (Only in CRTCs 0, 3 and 4). DD: Display Skew (Only in CRTCs 0, 3 and 4). II: Interlace Mode (00 = No interlace; 01 = Interlace Sync; 10 = No Interlace; 11 = Interlace Sync and Video).
|-
|9||Maximum Raster Address (aka Number of Scan Lines) (-1)||xxx00000||7||Maximum scan line address on CPC can hold between 0 and 7, higher values' upper bits are ignored
