Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
MASM Index
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  │ABCDEFGHIJKLMNOPQ│R│STUVWX-Z*│
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   .RADIX directive          Set Default Radix (Number Base)
    radix overrides          Radix Specifiers
    RCL instruction          Rotate Carry Flag Bits Left
    RCR instruction          Rotate Carry Flag Bits Right
    read-only memory         ROM Locations
    READONLY                 Define Segment
    READONLY│NOREADONLY
       option                Make Code Segment Read-Only
    REAL10 directive         Declare Variables
    REAL4 directive          Declare Variables
    REAL8 directive          Declare Variables
    RECORD directive         Declare Record
    recording functions      Int 21h
    recording functions
       (FCB)                 Int 21h
    records                  Complex Data Types
    remainder (MOD)          Arithmetic Operators
    REP instruction          Repeat String
    REPcondition instruction Repeat String Conditionally
    REPEAT directive         Repeat Assembly of Block
   .REPEAT directive         Code Repeat Blocks
    requested privilege
       level (ARPL)          Processor Control Instructions
    RET instruction          Return from Procedure/Subroutine
    RETF instruction         Far Return from Procedure/Subroutine
    RETN instruction         Near Return from Procedure/Subroutine
    reversed division        Coprocessor Arithmetic Instructions
    reversed subtraction     Coprocessor Arithmetic Instructions
    right, rotating bits     ROR Instruction
    right, shifting bits     SAR Instruction
    ROL instruction          Rotate Operand Bits Left
    ROR instruction          Rotate Operand Bits Right
    round                    FRNDINT Instruction
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