BRZ instruction execution tested successfully (code copied and adjusted from original control unit test).
SKZ instruction execution tested successfully (code copied and adjusted from original control unit test).
SKZ instruction execution tested successfully (code copied and adjusted from original control unit test).
BRE instruction execution tested successfully (code copied and adjusted from original control unit test).
BRNE instruction execution tested successfully (code copied and adjusted from original control unit test).
HALT instruction execution tested successfully (code copied and adjusted from original control unit test).
Finished preliminary/essential testing for standard mode of operation.
Old testing code commented out since introduction of Stage classes to handle stages of instruction cycle. Pending deletion. Tests will be added for overall instruction cycle soon.