VT8601 Via, VT8601 Datasheet - Page 85

• Manufacturer Part Number: VT8601
• Description: Slot-1 / Socket-370 PCI North Bridge
• Manufacturer: Via

Graphics Playback Control Registers
SR52-50 – Playback Color Key Data ............................... RW
SR56-54 – Playback Color Key Mask ............................. RW
SR57 – Playback Video Key Mode Function .................. RW
Graphics BIOS Scratch Pad Registers
SR5A – Scratch Pad 0 ....................................................... RW
SR5B – Scratch Pad 1 ....................................................... RW
SR5C – Scratch Pad 2 ....................................................... RW
SR5D – Scratch Pad 3 ....................................................... RW
SR5E – Scratch Pad 4 ....................................................... RW
SR5F – Scratch Pad 5 ....................................................... RW
Revision 1.3 September 8, 1999
23-16 Playback Color Key for True Color Mode
23-16 Playback Color Key Mask for True Color Mode
15-8 Playback Color Key for High Color Mode
15-8 Playback Color Key Mask for High Color Mode
7-0
7-0
7-0
7HFKQRORJLHV ,QF
Playback Color Key for 256 Color Mode
Playback Color Key Mask for 256 Color Mode
Overlay Key Type
Defines all 256 defferent types of mixing among
VGA Color Key, Playback Window Key, and Video
Chroma Key (very similar to ROP3 code). Below
are some common combinations:
:H &
:H &R R QQHFW
AA Chromakey Only
CC Playback Key Only
C0 Colorkey & Playback Key
F0 Color Key Only
FF Video Port Only
00 VGA Port Only
88 Playback Key & Chromakey
80 Colorkey & Playback key & Chromakey
QQHFW
-79
Graphics Second Playback Control Registers
SR62-60 – 2
SR66-64 – 2
23-16 Playback Color Key for True Color Mode
23-16 Playback Color Key Mask for True Color Mode
15-8 Playback Color Key for High Color Mode
15-8 Playback Color Key Mask for High Color Mode
7-0
7-0
Playback Color Key for 256 Color Mode
Playback Color Key Mask for 256 Color Mode
nd
nd
Playback Color Key Data ........................ RW
Playback Color Key Mask ....................... RW
VT8601 Apollo ProMedia
VGA Extended Registers