ENHANCED AST-5251/11                                AST Part Number 202139-001
ENHANCED AST-5251/11 PLUS                           AST Part Number 202139-002

This board is used for local communication with IBM system 34/36/38 and
AS-400.  There are four settings on this board that need to be configured or
checked by the user before installation.  These are

    - Termination selection switch.
    - IRQ selection jumper block.
    - I/O address selection jumper block.
    - Plus option chip


SWITCH SETTINGS

    Termination selection switch:

        This is an external toggle switch that can be accessed from the
        backside of the PC to set it either in "Termination" mode or in
        "Through" mode.  The modes are marked on the supporting bracket.


JUMPER SETTINGS

    IRQ jumper block:

         Jumper #         Setting
        ----------------------------------
           E8              IRQ 2 (Default)
           E9              IRQ 3
           E10             IRQ 4
           E11             IRQ 5

    If any other board or device is using IRQ 2 then the emulation board gives
    an "Interrupt chain error" message during the execution of the
    "Kernel.exe" program.  In this case use of IRQ 3 or IRQ 5 is recommended.


JUMPER SETTINGS

    I/O Address jumper block:

         Jumper #          Address Range
        -----------------------------------------
           E4              0550h - 0557h
           E5              0450h - 0457h
           E6              0350h - 0357h
           E7              0250h - 0257h (Default)


PLUS OPTION CHIP

    AST-5251/11 board comes with empty socket at location U21.  The Plus
    option chip is installed in a socket (Location U21) on the AST-5251/11
    PLUS boards.  This chip gives the capability of getting multiple sessions
    from the same workstation during emulation.  There are two different kinds
    of plus chips which can be used with this board depending on whether the
    board is used in 5250 Cluster, 5250 Gateway or stand alone application.










SWITCH AND JUMPER SETTINGS

    ͻ
                                                                    
                                                                   Ķ
                                                                     TERM
                     PLUS                                           ----+
                     OPTION                    I/O  *                THRU
                      -----                ADDRESS  *            *  
                     |     | U21           JUMPER   *     IRQ    *  
                      -----                BLOCK    *     JUMPER *  
                                                          BLOCK  * Ķ
    ͻ            ͼ 
                                                  ͼ      
                                                                      
