Commodore Amiga - Control Registers

CONTROL REGISTERS
SPROPOS
SPRIPTH
SPR2PTH
SPR3PTH
SPR4PTH
SPR5PTH
SPR6PTH
SPR7PTH
SPRIPTL
SPR2PTL
SPR3PTL
SPR4PTL
SPR5PTL
SPR6PTL
SPR7PTL
This is the sprite 0 position register. The word written into this register controls the
position on the screen
at which the upper left-hand corner of the sprite is to be placed.
The most significant bit of the first data word will be placed in this position on the
screen. Note
that the sprites have a placement resolution on a full screen of 320 by 200.
The sprite resolution is independent of the bit-plane resolution.
Bit positions:
oBits 15-8 specify the vertical start position, bits V7 - VO.
oBits 7-0 specify the horizontal start position, bits H8 - HI.
NOTE
This register is normally only written by the sprite DMA channel itself.
See the details above regarding the organization of the sprite data. This
register
is usually updated directly by DMA.
SPROCTL
This register is normally used only by the sprite DMA channel. It contains control infor-
mation
that is used to control the sprite data-fetch process.
Sprite Hardware 125