The internal decode of the memory and the Chip Select circuit (not show in Figure 3.6) decode the address and identify register 〖2002〗_H. The control signal (MREQ) ̅ and (RD) ̅ are used to enable the memory output buffer. The data bus, which was in high impedance state, is activated as an input bus (to the microprocessor) shortly contents (〖47〗_H) on the data bus