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F6E9: Read Keyboard Combined
Control mode 01: reads both keyboard rows via Read_Keyboard_Rows and ANDs them together before returning to Read_Control_Input_Return.
Read_Control_Keyboard_Combined F6E9 CALL Read_Keyboard_Rows Call Read_Keyboard_Rows to read both keyboard rows.
F6EC AND C Combine the two row results.
F6ED RET Return to Read_Control_Input_Return.
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