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Currently I have this 4 bit CPU as shown in the schematic diagram below. enter image description here

What I wish to achieve:

  • Add one more output register to make the CPU output a total of 8 bits
  • Show alphabet using the 8 bits output

My current trial:

  • Cout of the first IC connected to Cin of the second IC
  • Cascaded in a synchronous fashion enter image description here

What I unsure/don't understand:

  • Should I connect the A~D pins of the second register to ALU?
  • The LOAD-bar pin is connected to LO-bar of the ALU. Should I add one more LO-bar to the ALU and connect it to the LOAD-bar of the second register?
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