+-------+
                                RCSR:   |   0   |
                                        +-------+
 
                                +--------+
                        OTTKS:  | RCSR   |
        +-------+               +--------+
$TTKS:  |       |-----> TTKS:   |c(RCSR) |
        +-------+               +--------+
 
                                +--------+
                        OTTKB:  | RDAT   |
        +-------+               +--------+
$TTKB:  |       |-----> TTKB:   |        |
        +-------+               +--------+
 
                                +--------+
                        OXTTNR: | TNRRTN |
                                +--------+
        +-------+
$XTTNR: |       |-----> XTTNR:  Simulated action routine for no input space
        +-------+