1. VDP1 features
1.1 What is VDP1?
・System configuration
・Functions of VDP1
1.2 Screen mode
・Screen mode and display range
・Frame buffer rotation readout

2. address map
2.1 Address map
・Frame buffer
・System register
2.2 Tables on VRAM

3. Process flow
・Flow of drawing procedure
・Flow of command table
・Table reference

4. system register
・System register list
4.1 TV mode selection register
4.2 Frame buffer switching mode register
・Sequence when using erase & change・Usage example
4.3 Plot trigger register
4.4 Erase write
・Erase write data register
・Erase write upper left coordinate register
・Erase write lower right coordinate register
4.5 Forced drawing termination register
4.6 Transfer end status register
4.7 Processing suspension table address register
4.8 Current processing table address register
4.9 Mode Status Register

5. table
5.1 Character pattern table
5.2 Color Lookup Table
・Lookup table mode・Character pattern・Command table
5.3 Gouraud shading table
- Gouraud shading
- Gouraud shading specification
- Gouraud shading processing
5.4 Command table

6. command table
6.1 CMDCTRL (Control Word)
6.2 CMDLINK (LINK specification)
6.3 CMDPMOD (Drawing Mode Word)
high speed shrink
Pre-clipping disabled
User clipping enabled
User clipping mode
mesh enabled
End code invalid
Transparent pixels disabled
color mode
color calculation
MSB on
6.4 CMDCOLR (Color Control Word)
color bank
color lookup table
non-textured color
6.5 CMDSRCA (Character Address)
6.6 CMDSIZE (character size)
6.7 CMDXA~CMDYD (vertex coordinate data)
6.8 CMDGRDA (Gouraud shading table)

7. command
7.1 System clipping coordinate setting command
・System clipping
7.2 User clipping coordinate setting command
・User clipping
7.3 Relative coordinate setting command
・Relative coordinates
7.4 Standard sprite drawing commands
7.5 Rectangular sprite drawing commands
・Specify two coordinates (rectangular sprite drawing command)
・Fixed point specification (rectangular sprite drawing command)
7.6 Transform sprite drawing commands
7.7 Polygon drawing commands
7.8 Polyline drawing commands
7.9 Line drawing commands
7.10 Drawing end command

8. quick reference

9. Precautions for use
・VDP1 general
・System register
・Command

explanation of words

Table of contents

Index

(C)SEGA ENTERPRISES, LTD., 1997