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V blank flag : Vertical blank flag (VBLANK), bit 3
Indicates the vertical scanning status of the TV screen. 

 VBLANK 
 Vertical scanning state 
 0 
 Scanning is in the vertical display period 
 1 
 Scan during vertical blanking (VBLANK)

H blank flag : Horizontal blank flag (HBLANK), bit 2
Indicates the horizontal scanning status of the TV screen. 

 HBLANK 
 Horizontal scan state 
 0 
 Scan is in horizontal display 
 1 
 Scan during horizontal retrace (HBLANK)

Scan field flag : Odd / even field flag (ODD), bit 1
Indicates the scanning status when the TV screen mode is interlace mode. Always 1 in non-interlaced mode. 

 ODD 
 Table display 
 0 
 During even field period 
 1 
 Scan during odd field period

TV system flag : PAL / NTSC flag (PAL), bit 0
Indicates the TV system status. 

 PAL 
 Table display 
 0 
 NTSC method 
 1 
 PAL method

VRAM size (Readable)

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