%  Short subroutine call (only affecting low part of PC)

inhibit_i
inhibit_i
inhibit_i
inhibit_i

% PC now points to the low address of the address to jump to.
% We must first push low part of PC onto stack.
% Return address will the be this pushed value plus 1.

            ld_inc  sel_sp           dec
                    sel_sp           dec
sel_lo_pc   ld_mem  sel_inc  ld_sp   dec
sel_lo_pc           sel_inc          dec

% Move PC to J register, so that PC can be modified

ld_j         sel_pc
             sel_pc

% J register now points to the address of low part of
% jump address. Read new low jump address into PC_LO

sel_j_pc     sel_mem     ld_lo_pc
sel_j_pc     sel_mem

0
reset inhibit_i