Using OSC4 and FJKRD (JK-FF) clock signals of four different frequencies were generated and provided to the macro. X74-153 chose one of these clocks according to the DIP switches setting. Five LED's displayed four clocks and one selected by X74-153. Test circuit is shown in Figure 0.1.
Figure: Test Circuit for X74-153 (4-to-1 Multiplexer)
