MOUSE Computer Lecture L 6 9 MOUSE Computer

MOUSE Computer Lecture L 6. 9

MOUSE Computer Microcomputer of Oakland University’s School of Engineering

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

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

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

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

MOUSE Keypad Decoding +5 V 10 KW 4 -to-16 Decoder PA 0 PA 1 PA 2 PA 3 CA 2 18 19 23 22 21 20 0 1 74154 2 3 4 A 5 6 B 7 8 C 9 10 D 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 13 14 15 16 17 CA 1

7 -Segment Display

MOUSE 7 -Segment Displays PB 0 a PB 1 b PB 2 c PB 3 d PB 4 e PB 5 f PB 6 8 8 8 PA[4. . 7] 7442 BCD/Decimal Decoder g

MOUSE 7 -Segment Displays PB 0 1 a PB 1 0 b PB 2 1 c PB 3 1 d PB 4 0 e PB 5 1 f PB 6 1 8 8 5 8 8 8 1 1 0 PA[4. . 7] 0010 0 1 2 1 3 1 1 4 7442 BCD/Decimal Decoder 5 g

CSE 171 a 0097 0098 0099 009 A 009 B 009 C 39 6 D 79 06 07 06 C S E 1 7 1 f b g e c d

Print Message 0030 0033 0036 0039 CE BD BD 20 0097 B 84 C B 824 FB LDX JSR BRA #$0097 MOVMES SIXDS -5

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

MOUSE Memory Map Device RAM 1 (internal) RAM 2 PROM PIA Hex Address 0000 -007 F 0080 -00 FF B 800 -BFFF 8000 -8003