-`define STORE_BUTTON buttons[8]
-`define CLEAR_BUTTON buttons[9]
-`define PC_INC_BUTTON buttons[10]
-`define PC_DEC_BUTTON buttons[11]
-`define PC_CLR_BUTTON buttons[12]
-`define ACCUM_CLR_BUTTON buttons[13]
-`define RUN_BUTTON buttons[14]
-`define EXECUTE_BUTTON buttons[15]
-