• The screen mode and the coordinate values ​​displayed at that time are as follows.

Table 1.2 Screen mode and display range

Screen mode	X range		Y range
	Standard	High resolution
Non-interlaced Single-dense interlaced NTSC, PAL 320 x 224 pixels 320 x 240 pixels 352 x 224 pixels 352 x 240 pixels	0≦X≦319 0≦X≦319 0≦X≦351 0≦X≦351	0≦X≦639 0≦X≦639 0≦X≦703 0≦X≦703	0≦Y≦223 0≦Y≦239 0≦Y≦223 0≦Y≦239
Double dense interlaced NTSC, PAL 320 x 224 pixels 320 x 240 pixels Width 352 x Height 224 pixels Width 352 x Height 240 pixels	0≦X≦319 0≦X≦319 0≦X≦351 0≦X≦351	0≦X≦639 0≦X≦639 0≦X≦703 0≦X≦703	0≦Y≦447 0≦Y≦479 0≦Y≦447 0≦Y≦479
Non-interlaced 31KC, HDTV 320 x 240 pixels 352 x 352 x 240 pixels	0≦X≦319 0≦X≦351		0≦Y≦239 0≦Y≦239

• However, this is a coordinate range, not a size that occupies the frame buffer. For the size of the frame buffer, please refer to “ Frame buffer (2.1 address map) ”.
  
• In the case of high resolution, it becomes 8bit / pixel which is half of the standard time. At this time, the frame buffer cannot be rotated.
  
• The frame buffer cannot be rotated during double-interlace.
  
• Interlace is one frame in both frame buffers when switching the frame buffer for each field (double dense interlace).
  
• When switching the frame buffer every two fields (single density interlace), the same picture is displayed in the even and odd fields. In either case, the gap between the scan lines will not be empty.
  
• In single density interlace, the resolution is the same as in non-interlace, and the writing method to the frame buffer is the same.
  
• In 31KC and HDTV, the same color is displayed in units of 4 pixels, 2 pixels vertically and 2 pixels horizontally. In other words, the resolution is the same as the standard 320x240 (31KC) and 352x240 (HDTV), and the writing method to the frame buffer is the same.
  
• Please refer to the VDP2 manual for how to set interlace.
  

  [Note] field: Time for scanning line to scan one screen. 1/60 second.

  Frame: The period during which one image is displayed. If it is interlaced, it becomes 1/30 seconds because it becomes 1 frame in 2 fields.