Vorrichtung zum kontrollierten Entfernen und Einsetzen von elektrischen Schaltkreis-Modulen

An electronic circuit board (l0l, l02) electrically connected to a bus (l50), may be removed and re-inserted in the system without the necessity of disabling other circuits connected to the bus (l50). A latch actuated switch (ll3) provides a control signal in anticipation of circuit board insertion or removal. The control signal activates a control circuit (l20) which seizes control of the bus after completion of other bus communications and stops the generation of clock pulses normally required in transmission of signals on the bus (l50). When the other bus communications have ceased, the control circuit (l20) controls power supply circuitry (l05) to remove power from the board (l0l, l02). When insertion of removal of the board (l0l, l02) is complete, the control circuit (l20) will restore the bus clock pulses and relinquish control of the bus.