|7||Vertical Sync Position||x0000000||30||When to start the VSync signal, in characters.
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|8||Interlace and Skew||CCDDxxII||0||CC: Cursor Skew (Only in CRTC0). DD: Display Skew (Only in CRTCs 0, 3 and 4). 00II: Interlace Mode (00 = No interlace; 01: = Interlace Sync Raster Scan Mode; 10: = No Interlace; 11: = Interlace Sync and Video Raster Scan Mode).
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|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