TurboVision Video Adapter                           AST Part Number 202145-001

The TurboVision video adapter is designed specifically for use with the AST
TurboVision full page (8-1/2 x 11) monitor.  This is a 16-bit video board
rated to operate in machines from 4 to 12 MHz.  When the system is booted, the
TurboVision defaults to monochrome mode, and with proper video drivers, can
achieve up to 1024x1280 resolution on the full page screen.


SWITCH SETTINGS

    ROM Starting Address                  RAM Starting Address

              SW1  SW2  SW3                         SW4  SW5  SW6
              ---  ---  ---                         ---  ---  ---
    0C0000h   ON   ON   ON   (Default)    0A0000h   OFF  ON   ON   (Default)
    0C4000h   ON   ON   OFF               0A8000h   OFF  ON   OFF
    0C8000h   ON   OFF  ON                0B0000h   OFF  OFF  ON
    0CC000h   ON   OFF  OFF               0B8000h   OFF  OFF  OFF
    0D0000h   OFF  ON   ON                0C0000h   ON   ON   ON
    0D4000h   OFF  ON   OFF               0C8000h   ON   ON   OFF
    0D8000h   OFF  OFF  ON                0D0000h   ON   OFF  ON
    0DC000h   OFF  OFF  OFF               0D8000h   ON   OFF  OFF

    NOTES: ROM and RAM addresses should remain at default unless a monochrome
           or EGA adapter is also installed in the system.  If TurboVision is
           configured to run in 16-bit mode, the RAM address should remain at
           0B8000h or lower.  TurboVision ROM requires 16K of space; RAM
           requires 32K.


SWITCH SETTINGS

    SW7 - Base I/O Address
          ON  - 0270h-0277h (Default)
          OFF - 0370h-0377h

    SW8 - MDA Emulation at Boot
          ON at all times unless monochrome adapter is in system also


JUMPER SETTINGS

    E1 - Data Transfer Rate
        1 & 2 Attached - 16-bit
        Use if installed in 16-bit Bus and no 8-bit devices share a
        128K Segment with the TurboVision RAM address.

    2 & 3 Attached - 8-bit
        Default


SWITCH AND JUMPER LOCATIONS

ͻ
                                                                
                                                               Ķ
                                                  SW1-8         
                                                 +-----+        
                                                 +-----+        
                                                :::             
                                                E1              
                                                               Ķ
ͻ        ͻ            ͼ 
                                   ͼ ͼ      
                                                                  
