VGA/SVGA Video Programming--VGA Functional Index

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Hardware Level VGA and SVGA Video Programming Information +Page + +VGA Functional Index +

+ + +

Register Access Functions +
These fields control the +acessability/inaccessability of the VGA registers. These registers are +used for compatibiltiy with older programs that may attempt to program +the VGA in a fashion suited only to an EGA, CGA, or monochrome card. +

+CRTC Registers Protect Enable -- Vertical Retrace +End Register
+Enable Vertical Retrace Access -- End Horizontal +Blanking Register
+Input/Output Address Select -- Miscellaneous +Output Register

+Display Memory Access Functions +
These fields control the +way the video RAM is mapped into the host CPU's address space and how memory +reads/writes affect the display memory. +

+Bit Mask -- Bit Mask Register
+Chain 4 Enable -- Sequencer Memory Mode Register
+Chain Odd/Even Enable -- Miscellaneous Graphics +Register
+Color Compare -- Color Compare Register
+Color Don't Care -- Color Don't Care Register
+Enable Set/Reset -- Enable Set/Reset Register
+Extended Memory -- Sequencer Memory Mode Register
+Host Odd/Even Memory Read Addressing Enable -- Graphics +Mode Register
+Host Odd/Even Memory Write Addressing Enable -- Sequencer +Memory Mode Register
+Logical Operation -- Data Rotate Register
+Memory Map Select -- Miscellaneous Graphics Register
+Memory Plane Write Enable -- Map Mask Register
+Odd/Even Page Select -- Miscellaneous Output +Register
+RAM Enable -- Miscellaneous Output Register
+Read Map Select -- Read Map Select Register
+Read Mode - Graphics Mode Register
+Rotate Count -- Data Rotate Register
+Set/Reset -- Set/Reset Register
+Write Mode -- Graphics Mode Register

+Display Sequencing Functions +
These fields affect the +way the video memory is serialized for display. +

+256-Color Shift Mode -- Graphics Mode Register
+9/8 Dot Mode -- Clocking Mode Register
+Address Wrap Select -- CRTC Mode Control Register
+Alphanumeric Mode Disable -- Miscellaneous Graphics +Register
+Asynchronous Reset -- Reset Register
+Byte Panning -- Preset Row Scan Register
+Character Set A Select -- Character Map Select +Register
+Character Set B Select -- Character Map Select +Register
+Divide Memory Address Clock by 4 -- Underline +Location Register
+Double-Word Addressing -- Underline Location Register
+Pixel Shift Count -- Horizontal Pixel Panning +Register
+Line Compare -- bit 9: Maximum Scan Line Register, +bit 8: Overflow Register, bits 7-0: Line +Compare Register
+Line Graphics Enable -- Attribute Mode Control +Register
+Map Display Address 13 -- CRTC Mode Control Register
+Map Display Address 14 -- CRTC Mode Control Register
+Maximum Scan Line -- Maximum Scan Line Register
+Offset -- Offset Register
+Pixel Panning Mode -- Attribute Mode Control Register
+Preset Row Scan -- Preset Row Scan Register
+Scan Doubling -- Maximum Scan Line Register
+Screen Disable -- Clocking Mode Register
+Shift Four Enable -- Clocking Mode Register
+Shift/Load Rate -- Clocking Mode Register
+Shift Register Interleave Mode -- Graphics Mode +Register
+Start Address -- bits 15-8: Start Address High +Register, bits 7-0: Start Address Low Register
+Sycnchronous Reset -- Reset Register
+Word/Byte Mode Select -- CRTC Mode Control Register

+Cursor Functions +
These fields affect the +operation of the cursor displayed while the VGA hardware is in text mode. +

+Cursor Disable -- Cursor Start Reguster
+Cursor Location -- bits 15-8: Cursor Location +High Register, bits 7-0: Cursor Location Low +Register
+Cursor Scan Line End -- Cursor End Register
+Cursor Scan Line Start -- Cursor Start Reguster
+Cursor Skew -- Cursor End Register

+Attribute Functions +
These fields control the +way the video data is submitted to the RAMDAC, providing color/blinking +capability in text mode and facilitating the mapping of colors in graphics +mode. +

+8-bit Color Enable -- Attribute Mode Control Register
+Attribute Address -- Attribute Address Register
+Attribute Controller Graphics Enable -- Attribute +Mode Control Register
+Blink Enable -- Attribute Mode Control Register
+Color Plane Enable -- Color Plane Enable Register
+Color Select 5-4 -- Color Select Register
+Color Select 7-6 -- Color Select Register
+Internal Palette Index -- Palette Registers
+Monochrome Emulation -- Attribute Mode Control +Register
+Overscan Palette Index -- Overscan Color Register
+Underline Location -- Underline Location Register
+Palette Address Source -- Attribute Address Register
+Palette Bits 5-4 Select -- Attribute Mode Control +Register

+DAC Functions +
These fields allow control +of the VGA's 256-color palette that is part of the RAMDAC. +

+DAC Write Address -- DAC Address Write Mode +Register
+DAC Read Address -- DAC Address Read Mode Register
+DAC Data -- DAC Data Register
+DAC State -- DAC State Register

+Display Generation Functions +
These fields control the +formatting and timing of the VGA's video signal output. +

+Clock Select -- Miscellaneous Output Register
+Display Disabled -- Input Status #1 Register
+Display Enable Skew -- End Horizontal Blanking +Register
+Divide Scan Line Clock by 2 -- CRTC Mode Control +Register
+Dot Clock Rate -- Clocking Mode Register
+End Horizontal Display -- End Horizontal Display +Register
+End Horizontal Blanking -- bit 5: End Horizontal +Retrace Register, bits 4-0: End Horizontal +Blanking Register,
+End Horizontal Retrace -- End Horizontal Retrace +Register
+End Vertical Blanking -- End Vertical Blanking +Register
+Horizontal Retrace Skew -- End Horizontal Retrace +Register
+Horizontal Sync Polarity -- Miscellaneous +Output Register
+Horizontal Total -- Horizontal Total Register
+Memory Refresh Bandwidth -- Vertical Retrace End +Register
+Start Horizontal Blanking -- Start Horizontal +Blanking Register
+Start Horizontal Retrace -- Start Horizontal Retrace +Register
+Start Vertical Blanking -- bit 9: Maximum Scan +Line Register, bit 8: Overflow Register, +bits 7-0: Start Vertical Blanking Register
+Sync Enable -- CRTC Mode Control Register
+Vertical Display End -- bits 9-8: Overflow Register, +bits 7-0: Vertical Display End Register
+Vertical Retrace End -- Vertical Retrace End Register
+Vertical Retrace -- Input Status #1 Register
+Vertical Retrace Start -- bits 9-8: Overflow Register, +bits 7-0: Vertical Retrace Start Register
+Vertical Sync Polarity -- Miscellaneous Output +Register
+Vertical Total -- bits 9-8: Overflow Register, +bits 7-0: Vertical Total Register

+Miscellaneous Functions +
These fields are used to +detect the state of possible VGA hardware such as configuration switches/jumpers +and feature connector inputs. +

+Feature Control Bit 0 -- Feature Control +Register
+Feature Control Bit 1 -- Feature Control +Register
+Switch Sense -- Input Status #0 Register

+Notice: All trademarks used or referred to on this page are the property +of their respective owners. +
All pages are Copyright © 1997, 1998, J. D. Neal, except where +noted. Permission for utilization and distribution is subject to the terms +of the FreeVGA Project Copyright License. +
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