The TRUE or FALSE value of a Boolean simple variable and the value of any other Boolean operand depend only on the low-order bit (bit zero) of the word. Each of the 48 bits of a Boolean simple variable contains a Boolean value that can be interrogated or altered by using the partial word part or concatenation.

When a Boolean simple variable is allocated, it is initialized to FALSE, a 48-bit word with all bits equal to 0 (zero).

Refer to Data Representation for additional information on the internal structure of a Boolean operand.