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■ Function

The main functions of VDP1 are as follows.
Drawing
Parts, color mode, and coordinates are controlled by the command table on VRAM, and display of the frame buffer is controlled by system registers.

● Parts

The parts drawn by VDP1 can be divided into texture parts and non-texture parts depending on whether or not there is an original picture. The parts classification is shown in Table 3.4.

Table 3.4 Parts classification 
 category 
 part name 
 
 Definition method 
 Parts 
 Texture Parts 
 Standard Sprite 
 Character, 
 Vertical Upside Down, Horizontal Flip 
 Reading Direction of One Vertex 
 Rectangle Sprite 
 Character, 
 Vertical Up / Down, Left / Right Reverse, 
 Expand / Reduce / Extend 
 Reading direction of 2 vertices or stationary 
 Point and width and reading direction 
 Transform Sprite 
 Character, 
 Vertical Upside Down, Left / Right Reverse, 
 Scale, Stretch, 
 Rotate , Twistable 
 4 vertex reading directions 
 Non-textured parts 
 Polygon 
 Rectangle , 
 filled 
 4 vertices 
 Polyline 
 Rectangle 
 4 vertices 
 Line 
 Line 
 Start and end

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