specifies whether the assembler performs magnitude
validation of signed or unsigned immediate-data machine
instruction operands occupying 1 to 3 bytes, ensuring that
the specified value fits within the operand field.
REGISTER | NOREGISTER
specifies whether or not the assembler will perform type checking
of register fields of machine instruction operands.
SIGNED | NOSIGNED
specifies whether magnitude validation of immediate-data operand values should take into account whether the field is signed, or should allow both signed and unsigned values regardless.
