Subroutine Linkage Instructions

This section describes the commands which call and cause return from subroutines.
They cause a transfer of program control and use the address stack XXXX(see Sections 2.4 and 2.7•7)XXX

Code	Description
JMS	Call subroutine and push return address onto stack.
BBL	Return from subroutine and load accumulator with immediate DATA.