Commodore Amiga - SCREEN POSITION

DDFSTRT - Data-fetch Start
(Beginning position for data fetch)
Bits 15-8 - not used
Bits 7-3 • pixel position H8-H4
Bits 2-0 • not used
DDFSTOP - Data-fetch Stop
(Ending position for data fetch)
Bits 15-8 • not used
Bits 7·3 • pixel position H8-H4
Bits 1·0 - not used
BPLxPTH - Bit-plane Pointer
(Bit-plane pointer high word, where x is the bit-plane number)
BPLxPTL - Bit-plane Pointer
(Bit-plane pointer low word, where x is the bit-plane number)
DIWSTRT - Display Window Start
(Starting vertical and horizontal coordinates)
Bits
15-8· VSTART (V7·VO)
Bits 7-0 - HSTART (H7-HO)
DIWSTOP - Display Window Stop
(Ending vertical and horizontal coordinates)
Bits
15-8· VSTOP (V7-VO)
Bits 7-0 - HSTOP (H7-HO)
BPLIMOD - Bit-plane Modulo
(Odd-numbered bit-planes, playfield 1)
BPL2MOD - Bit-plane Modulo
(Even-numbered bit-planes, playfield 2)
Playfield Hardware 85