1. COSC121: Computer Systems
Jeremy Bolton, PhD
Assistant Teaching Professor
Constructed using materials:
- Patt and Patel Introduction to Computing Systems (2nd)
- Patterson and Hennessy Computer Organization and Design (4th)
**A special thanks to Rich Squier and M. Schmalz

2. Outline Course Outline Overview and Continuity of COSC-120
See Course Syllabus
Overview and Continuity of COSC-120
Big Picture

3. Big Picture A computer is a concert of many levels of abstraction
COSC 121: Computer Systems
Application (Browser)
Operating
System
(Win, Linux)
Compiler
COSC 255: Operating Systems
Software
Assembler
Drivers
Instruction Set
Architecture
Hardware
Processor
Memory
I/O system
Datapath & Control
Digital Design
COSC 120: Computer Hardware
Circuit Design
transistors
A computer is a concert of many levels of abstraction

4. Big Picture: From C to Executable
temp = v[k];
v[k] = v[k+1];
v[k+1] = temp;
High Level Language Program (e.g., C)
Compiler
lw $t0, 0($2)
lw $t1, 4($2)
sw $t1, 0($2)
sw $t0, 4($2)
Assembly Language Program
Assembler
Machine Language Program
Machine Interpretation
Control Signal Specification

5. Major Topics Review ISA (LC3) From C to executable
Programming in Assembly
Compilation
Computer Architecture
Performance
Pipelining
Memory Hierarchy
Input / Output
Operating System (as a manager of resources)
Polling vs Interrupts
Traps
Non-traditional Computing **If time**

6. Projects (rough estimate!)
Programming in Assembly using PennSim
Project 4**
Driver for Memory Mapped,Textual Display
Project 5
Compilation from X to LC
Project 6: runtime stack
Project 7**: cache sim
Project 8 (if time)
Interrupts
COSC 121: Computer Systems
Application (Browser)
Operating
System
(Win, Linux)
Compiler
Software
Assembler
Drivers
Hardware
Processor
Memory
I/O system
Datapath & Control
Digital Design
Circuit Design
transistors

7. Why Me!?
Why are you here?
Why learn about hardware and underlying implementation?
Knowing a computers abilities and limitations based on hardware is very important as a programmer.
An int is not an Integer! A float is not a Real!
Assemblers and Compilers. Understanding the translation process is important as a programmer!
Lost in translation: The code you write is not necessarily the code executed!
Embedded systems and “time-critical” segments are programmed in assembly
Architecture and efficiency:
Pipelining
Memory Organization
Efficiency: time, space, energy

8. Things To Do! Software Tools To Be Used Unix Environment Subversion
PennSim
X Compiler (to LC3)
Electric / Verilog