Product specifications

VT8601A Apollo PLE133

Revision 1.82 October 22, 2001 -78- VGA Extended Registers

Technologies, Inc.

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Graphics Playback Control Registers

SR52-50 – Playback Color Key Data................................RW

23-16 Playback Color Key for True Color Mode

15-8 Playback Color Key for High Color Mode

7-0 Playback Color Key for 256 Color Mode

SR56-54 – Playback Color Key Mask ..............................RW

23-16 Playback Color Key Mask for True Color Mode

15-8 Playback Color Key Mask for High Color Mode

7-0 Playback Color Key Mask for 256 Color Mode

SR57 – Playback Video Key Mode Function...................RW

7-0 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:

00 VGA Port Only

F0 Color Key Only

CC Playback Key Only

AA Chromakey Only

88 Playback Key & Chromakey

C0 Colorkey & Playback Key

80 Colorkey & Playback key & Chromakey

FF Video Port Only

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

Graphics Second Playback Control Registers

SR62-60 – 2

Playback Color Key Data .........................RW