3100  (250-1632)            SVGA Video                 Faxback Doc. # 5506

The video circuitry for your computer is included on the main logic board.
This circuitry features:

-IBM VGA compatibility plus support for 16-color, 1024 x 768 graphics;
 256-color, 800 x 600 graphics; and 256-color, 640 x 480 graphics.

-A minimum of 512KB of video memory (RAM).

-Support for upgrading to 1MB of video memory (for computer models with
 512KB video memory)

-With 1MB memory option: support for 16.8-million color, 640 x 480
 graphics; 32K-color, 800 x 600 graphics; 16-color, 1280 x 1024 interlaced
 graphics; 256-color, 1024 x 768 non-interlaced graphics; and bit block
 transfer (BITBLT) for enhanced video performance with Windows and
 hardware cursor applications

-Support for 132-column text by 25 rows and by 43 rows.

-Compatibility with VGA analog monochrome and color, fixed- and multiple-
 frequency monitors (including 8514/A-compatible monitors).

In its default mode, the video supports most software designed for the EGA
and/or VGA standard.  You must use a VGA analog color or monochrome
monitor.  The video circuitry is also compatible with software written for
these video standards:

-VGA (Video Graphics Array)

-VESA (Video Electronics Standard Association)

-MCGA (Multi-Color Graphics Array)

-EGA (Enhanced Graphics Adapter)

-CGA (Color/Graphics Adapter)

-MDA (Monochrome Display Adapter)

The CLMODE.EXE video utility provided with your computer system enables
you to specify the type of monitor attached and change modes to optimize
video performance with certain MS-DOS applications.  The SETRES video
utility lets you specify video information for Windows applications.  The
available modes are listed in "Super Video Modes" and "Standard Video
Modes."

MAXIMUM Simultaneous Colors

The maximum number of simultaneous colors available with a screen
resolution depends on your monitor, application support for the video mode
set, and the amount of video memory available.  Refer to your monitor and
application documentation to determine mode and color support.  Refer to
the following table to check the maximum number of colors available with
the 512KB and 1MB video RAM configurations:

┌───────────┬────────────────────────────────────────────────┐
│Video      │                                                │
│Memory     │                                                │
│Installed* │  Maximum Number of Simultaneous Colors         │
├───────────┼─────────────┬──────────┬─────────┬─────────────┤
│           │ 1280x1024   │ 1024x768 │ 800x600 │ 640x480     │
├───────────┼─────────────┼──────────┼─────────┼─────────────┤
│512KB      │ Unavailable │   16     │  256    │  256        │
│1MB        │     16      │  256     │  64K    │16.8 million │
├───────────┴─────────────┴──────────┴─────────┴─────────────┤
│*Your computer has a minimum of 512KB of video memory.  To  │
│ upgrade to 1MB of memory, refer to "Installing Video       │
│ Memory".                                                   │
└────────────────────────────────────────────────────────────┘
Monitor Connection

Connect a VGA analog monitor to the video connector on the back of the
computer.  For an illustration, see "Setting Up Your System" in the
"Getting Started " section.

If you install an 8514/A-compatible expansion adapter, use a 26-pin pass-
through cable to connect the adapter to the VGA Feature connector of the
main logic board.  Refer to "Main Logic Board Layout" in the "Installing
Optional Hardware" section to locate the VGA Feature connector.  Contact
your computer dealer for the required cable.

Memory Considerations

The SVGA circuitry uses RAM within the A0000-BFFFF range for video memory
and uses RAM within the C0000-C7FFF range for the extended video BIOS.
These memory locations are used by standard VGA circuitry.  If you install
an EMS (Expanded Memory Specification) adapter or other device that is
configured to use these memory locations, a" memory conflict" can result.
Memory conflicts are errors caused when more than one device attempts to
use the same memory location.

The SVGA circuitry uses memory locations B0000-B7FFF for monochrome
mapping.  If you are running EMS software that uses this memory range,
either reconfigure the EMS driver or do not set the video for monochrome
mapping.

Refer to your device documentation for information about reconfiguring a
device to use memory locations other than those used by the SVGA
circuitry.

For an EMS adapter, you can usually designate the exclusions when starting
the EMS driver.  Consult your device documentation to determine the memory
locations used.

(smc-01/04/94)