1. MOUSE Computer Lecture L6.9

2. MOUSE Computer Microcomputer of Oakland University’s School of Engineering

3. MOUSE Designed and built in 1979 Based on 6802 microprocessor Hex keypad Six 7-segment displays

4. 6800 Microprocessor Accumulator A Accumulator B Condition Code Index Register X Stack Pointer, SP Program Counter, PC

5. MOUSE Commands 0. Examine Accumulator A 1. Examine Accumulator B 2. Examine Index Register, X 3. Examine Stack Pointer, SP 4. Examine Program Counter, PC 5. Examine Condition Code Register 6. Offset Calculation 7. Set Breakpoint

6. MOUSE Commands (cont.) 8. Continue program 9. Single step program A. Automatic data entry B. Back up one byte in memory C. Change byte in memory D. Do - execute program E. Examine memory F. Forward one byte in memory

7. MOUSE Keypad Decoding

8. 7-Segment Display

9. 888888 PA[4..7] 7442 BCD/Decimal Decoder abcdef g PB0PB1PB2PB3PB4PB5PB6 MOUSE 7-Segment Displays

10. 885888 PA[4..7] 7442 BCD/Decimal Decoder abcdef g PB0PB1PB2PB3PB4PB5PB6 MOUSE 7-Segment Displays 012345 1011011 110111 0010

11. CSE171 0097 39 C 0098 6D S 0099 79 E 009A 06 1 009B 07 7 009C 06 1 a b c d e f g

12. Print Message 0030 CE 0097 LDX #$0097 0033 BD B84C JSR MOVMES 0036 BD B824 JSR SIXDS 0039 20 FB BRA -5

13. MOUSE Layout PROM 2716 RAM 6810 MPU 6802 PIA 6821 Address Bus (16 lines) Data Bus (8 lines) To outside world

14. MOUSE Memory Map RAM1 (internal)0000-007F RAM20080-00FF PROMB800-BFFF PIA8000-8003 Device Hex Address