4016 SX  (250-4901)                Video                Faxback Doc. # 1574

The video circuitry for the Tandy 4016 SX is included on the main logic
board. This circuitry includes the following features:

* Full IBM Personal System/2 VGA Display Adapter compatibility.
* A color palette of more than 262,000 possible colors.
* Compatibility with VGA analog monitors.

Connect your color or monochrome VGA analog monitor to the 15-pin video
connector on the main logic board. Refer to Configuration Settings in the
Installing Optional Hardware section for video-related switch and jumper
settings.

Monitor and Software Compatibility:

The video circuitry is compatible with software written for the following
video standards on color or monochrome VGA analog monitors:

* VGA (Video Graphics Array)
* MCGA (Multi-Color Graphics Array)
* EGA (Enhanced Graphics Adapter)
* CGA (Color/Graphics Adapter)
* MDA (Monochrome Display Adapter)
* Hercules graphics mode

To emulate one of these video standards, use the vga.exe utility found on
the Utilities Diskette. This utility is discussed in detail in VGA 
Software.

CAUTION: Your VGA-compatible video circuitry requires the use of a VGA
analog monitor. Do not use any other type of monitor.

Default Configurations:

The video circuitry automatically configures itself to VGA text mode when
you turn on your system. Specifically, it defaults to monochrome text mode
for a monochrome monitor (or equivalent) or 80-column color text mode for a
color monitor. The vga.exe utility enables you to easily switch between
color and monochrome modes.

Operation:

Most application software that is designed for VGA or EGA video support 
will run automatically on your computer system with VGA. Just turn on the
computer, and install the application package as instructed by the software
manufacturer.

Configuring the Application Software:

Many application software packages include a setup, installation, or
configuration program to prepare the application for operation with the
particular hardware that you are using. Most newer software will be able to
run in the default configuration for the video circuitry.

Because some software packages are written specifically for certain 
non-EGA, non-VGA video hardware, you might need to configure the video 
circuitry to emulate the video adapter needed by the software. Use the 
vga.exe utility as described in VGA Software.  The chart on the next page 
lists the IBM-compatible video standards supported by the video.  The video
modes and resolutions available under each video standard are also listed.

   ┌──────────────────────────────────────────────────────────────┐
   │  Standard Video Modes                                        │
   ├────────────────────┬───────────────────┬─────────────────────┤
   │  Mode              │ Resolution        │ Simultaneous        │
   │  (text or graphics)│ (columns by rows) │ (colors(1)          │
   │                    │                   │ /mapping(2))        │
   ├────────────────────┴───────────────────┴─────────────────────┤
   │  VGA,EGA,and MCGA modes (startup defaults)                   │
   ├────────────────────┬───────────────────┬─────────────────────┤
   │  Monochrome Text   │ 80 x 25           │ -/monochrome        │
   ├────────────────────┼───────────────────┼─────────────────────┤
   │  Color Text        │ 80 x 25           │ 16/color            │
   │                    │ 40 x 25           │ 16/color            │
   ├────────────────────┼───────────────────┼─────────────────────┤
   │  Graphics          │ 320 x 200 (3)     │ 4/color             │
   │                    │ 640 x 200 (3)     │ 2/color             │
   │                    │ 320 x 200 (3)     │ 16/color            │
   │                    │ 640 x 200 (3)     │ 16/color            │
   │                    │ 640 x 350         │ 16/color            │
   │                    │ 640 x 350         │ -/monochrome        │
   │                    │ 320 x 200 (3)     │ 256/color           │
   │                    │ 640 x 480         │ 2/color             │
   │                    │ 640 x 480         │ 16/color,           │
   ├────────────────────┼───────────────────┼─────────────────────┤
   │  CGA mode          │ CGA mode          │ CGA mode            │
   ├────────────────────┼───────────────────┼─────────────────────┤
   │  Color Text        │ 80 x 25           │ 16/color            │
   │                    │ 40 x 25           │ 16/color            │
   ├────────────────────┼───────────────────┼─────────────────────┤
   │  Color Graphics    │ 320 x 200 (3)     │ 4/color             │
   │                    │ 640 x 200 (3)     │ 2/color             │
   ├────────────────────┴───────────────────┴─────────────────────┤
   │  Hercules Graphics mode and MDA mode                         │
   ├────────────────────┬───────────────────┬─────────────────────┤
   │  Monochrome Text   │ 80 x 25           │ -/monochrome        │
   ├────────────────────┼───────────────────┼─────────────────────┤
   │  Monochrome        │ 720 x 348         │ -/monochrome        │
   │  Graphics          │                   │                     │
   ├────────────────────┴───────────────────┴─────────────────────┤
   │  (1) Simultaneous colors refers to the number of colors or   │
   │  shades that can be displayed at one time.                   │
   │  (2) Simultaneous mapping refers to the type of old-style    │
   │  display for which the mode was originally designed.         │
   │  (3) 200-line vertical resolution modes are double-scanned   │
   │  to display 400 lines on the screen.                         │
   └──────────────────────────────────────────────────────────────┘

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