Defining Other Data

Defining DWORD and SDWORD Data 

 ; signed
 dword1  SDWORD  -12345678h
 ; unsigned array
 dword2  DWORD   10  DUP(?)
Type Usage
DWORD 32-bit unsigned integer
SDWORD 32-bit signed integer

Defining QWORD Data 

 qword1  QWORD  123456789ABCDEFh
Type Usage
QWORD 64-bit integer

Defining TBYTE Data 

 ; integer constant
tbyte1  TBYTE  0123456789ABCDEFh
Type Usage
TBYTE 80-bit integer

Defining Real Number Data
defines a 4-byte single-precision real variable. defines an 8-byte double-precision real, and defines a 10-byte double extended-precision real. 

 rVal1   REAL4   2.5
 rVal2   REAL4   -80000.21
 rVal3   REAL8   1.024E+04
 rVal4   REAL10  3.3455E-39
 rArray  REAL4   10  DUP(0.0)
Type Usage
REAL4 32-bit (4 bytes) IEEE short real
REAL8 64-bit (8 bytes) IEEE long real
REAL10 80-bit (10 bytes) IEEE extended real

A decimal real number consists of a mantissa and an optional exponent. The mantissa contains the sign, integer portion, and fractional portion. For the example of 4-byte IEEE real number, the sign occupies the most significant bit, the exponent fills 8 bits, and the mantissa fills the least significant 23 bits:

Bit Number 31 30   ...   23 22       ...       0
Component Sign Exponent Mantissa
Bit Value 1 11111111 11111111111111111111111






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      ― Unknown