The V-Smile PPU provides three layers of graphics: Two background planes and one sprite layer.
Currently this information is sourced from unununium and mame. Some features may be exclusive to newer chipsets and not be available on V-Smile.
Offset
Name
0x2810 - 0x281B
Page Registers
0x2820 - 0x2822
Segment Registers
0x282A
Blind Level Control
0x2830
Fade Effect Control
0x2836 - 0x2837
IRQ Position
0x283C - 0x283D
TV Control
0x2842
Sprite Control
0x2862
Video IRQ Enable
0x2863
Video IRQ Acknowledge
0x2870 - 0x2872
Sprite DMA
These registers use the base address of 0x2810 for Page 1 and 0x2816 for Page 2
0x00 - Scroll
0x02 - Attributes
0x03 - Control
0x04 - Tile Address
0x05 - Extended Attribute Address
Register
Function
Description
0x0
X-Scroll
?
0x1
Y-Scroll
?
Bits
Function
Description
0-1
Bits Per Pixel
0 = 2bpp, 1 = 4bpp, 2 = 6bpp, 3 = 8bpp
2
X-Flip
0 = Not Mirrored, 1 = Mirrored Horizontally
3
Y-Flip
0 = Not Mirrored, 1 = Mirror Vertically
4-5
Width
0 = 0, 1 = 256, 2 = 512, 3 = 768
6-7
Height
0 = 0, 1 = 256, 2 = 512, 3 = 768
8-11
Palette Bank
Offset into Palette Ram. 0 = 0, 1 = 0x100
12-13
Depth
?
14-15
Unused?
?
Bits
Function
Description
0
Bitmap Mode
0 = Tiled, 1 = Bitmap
1
RegSet
?
2
Wallpaper
?
3
Page Enable
0 = Disabled, 1 = Enabled
4
Row Scroll
0 = Disabled, 1 = Enabled
5
Horizontal Compression
?
6
Vertical Compression
?
7
Hi-Color
0 = Paletted, 1 = Direct Colour
8
Blend Enable
0 = Not Blended, 1 = Blended
9-15
Unused?
?
Bits
Function
Description
0-12
Tilemap Address
Memory Address of Tile-Map (0x0000-0x1FFF)
13-15
Unused
0x05 - Extended Attribute Address
Bits
Function
Description
0-12
Attribute Data Address
Memory Address of Attribute Data
13-15
Unused
Register
Function
Description
0x2820
Page 1 Segment
Page 1 Tile Data Address (Gets multipied by 0x40)
0x2821
Page 2 Segment
Page 2 Tile Data Address (Gets multipied by 0x40)
0x2822
Sprite Segment
Sprite Data Address (Gets multipied by 0x40)