1. Lecture 4 Z80 Introduction Hong, You Pyo, DGU 1

2. Youpyo Hong @ DGU Z80 Z80 is one of the most simple 8-bit microprocessor developed at 80’s. Z80 does not contain any ROM/RAM/Flash memory which is good feature for beginners. 2

3. Youpyo Hong @ DGU Z80 Pinouts 3

4. Youpyo Hong @ DGU RAM/ROM Pinouts 4 RAM : 62256ROM : 28256

5. Youpyo Hong @ DGU 62256, 28256 Address pin number is 15 and data pin number is 8. 2^15 = 32,768 32,768 * 8 = 262,144 bit 262,144/1,024 = 256 256K means 256K bit memory. 5

6. Youpyo Hong @ DGU CPU and Memory Connection 6

7. Youpyo Hong @ DGU Address Signal Connection 7

8. Youpyo Hong @ DGU Data Connection 8

9. Youpyo Hong @ DGU Two Potential Problems Two memories send out different voltages. 9 5V 0V Unwanted memory becomes open.

10. Youpyo Hong @ DGU 10 5V

11. Youpyo Hong @ DGU RAM Function Table 11

12. Youpyo Hong @ DGU HW #0 Download Z80, 28C256 (EEPROM) and 62256(SRAM) datasheet. Keep them in a ring binder. 12