This addressing mode requires either one or two words of extension
depending on the size of the operation.
Byte Operation -- operand is low oerder byte of extension word
Word Operation -- operand is extension word
Long Word Operation -- operand is in the two extension words,
high order 16-bits are in the first extension word,
low order 16 bits are in the second extension word.

Mode:\b 111 \bRegister: 100

Assembler Syntax:

Byte Format:
\i1--------88-bit Value,

Word Format:
\i1016-bit Value,

Long Word Format:
\i2032-bit Value,0 ,