Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    ECHO directive           Display Message during Assembly
    ELSE directive           IF Block Syntax
   .ELSE directive           Control-Flow Blocks
   .ELSEIF directive         Control-Flow Blocks
    ELSEIF[E] directive      Assemble if Expression True or False
    ELSEIF[N]B directive     Assemble if Argument Blank/Not Blank
    ELSEIF[N]DEF directive   Assemble if Symbol Defined/Not Defined
    ELSEIFDIF[I] directive   Assemble if Arguments Different
    ELSEIFIDN[I] directive   Assemble if Arguments Identical
    EMULATOR option          Floating-Point Code Generation
    enabling interrupts      FENI Instruction
                             SLI Instruction
    enabling interrupts
       (STI)                 Interrupt Vector Memory
    END directive            End Source File
    ENDIF directive          IF Block Syntax
   .ENDIF directive          Control-Flow Blocks
    ENDM directive           End Macro and Iterative Blocks
    ENDP directive           Define Procedure
    ENDS directive           End Segment and Structure Blocks
   .ENDW directive           End WHILE Blocks
    ENTER instruction        Create Stack Frame
   @Environment macro        Environment Variable Macro
    environment, coprocessor Numeric Coprocessor Environment
    EPILOGUE option          Register Macro as EPILOGUE
    EQ operator              Relational Operators
    EQU directive            String Equate with Macro Substitution
    equal sign (=)           Redefinable Numeric Equate
    equate, text             TEXTEQU
    ERR directive            Generate Severe Error
   .ERR[N]B directive        Generate Error for Missing Argument
    ERR[N]DEF directive      Generate Error for Undefined Symbol
   .ERRDIF/.ERRIDN directive Generate Error If Arguments Same/Different
   .ERRE/.ERRNZ directive    Generate Error If Argument Zero/Nonzero
    error codes              MS-DOS Extended
    EVEN directive           Align Data and Code
    example program, SHOW    List of SHOW Files
    example programs,
       templates             List of "Hello, World." Files
    example programs, TSR    List of TSR Files
    exceptions, clearing     FCLEX Instruction
   .EXIT directive           Generate Start-Up/Exit Code
    exiting .IF              Exit Iterative Directives
    exiting loops            Exit Iterative Directives
    EXITM directive          End Macro and Repeat Blocks
    exponentiation           Coprocessor Instructions
    EXPORT                   Select Default PROC Visibility
    EXPORT visibility        Define Procedure
    EXPR16 option            Select 16-Bit Expressions
    EXPR32 option            Select 32-Bit Expressions
    extended key codes       Extended Key Codes
    EXTERN directive         Define External Variables/Labels/Symbols
    EXTERNDEF directive      Define External Variables/Labels/Symbols
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