Sprite and Layers System Register

Number	TBRegisterNumber::$15
Readable	TBRegisterReadable::Yes
Writable	TBRegisterWritable::Yes
Short Description	[[ShortDesc::Enables/disables Sprites and Lores Layer, and chooses priority of sprites and Layer 2.]]

Bitmapped as follows:

Bit	Function
7	Enable Lores Layer
6	If 1, the sprite rendering order is reversed, i.e. sprite 0 is on top (0 after reset)
5	If 1, the clipping works even in "over border" mode (doubling X-axis coordinates of clip window) (0 after reset)
3-4	If %00, ULA is drawn under Layer 2 and Sprites; if %01, it is drawn between them, if %10 it is drawn over both
2	If 1, Layer 2 is drawn over Sprites, else sprites drawn over layer 2
1	Enable sprites over border (0 after reset)
0	Enable sprite visibility (0 after reset)

When both "over border" (bit 1) and "clipping over border" (bit 5) is enabled, the Sprite clipping window {{#ask: TBRegisterNumber::$19 }} ($19) X-axis coordinates are "doubled", and coordinates origin is moved from pixel [0,0] position to sprite [0,0] position ([-32,-32] pixel position). For example: setting clip coordinates as {x1:5, x2:155, y1:7, y2:248} will make sprites visible in area [10,7]..[309,248] (inclusively) in sprite coordinates.