CS 2734 Computer Organization II Lectures, Week 1

Read: Chapter 1 of PH

• Administrative details:
  • Coures goal
  • Course policy
  • Computer accounts
  • Logistics of the laboratories
  • Please bring your book to each class

• Brief Overview
  • Moore's Law - past and present

  • Basic components of a computer (Figure 1.10 is a key figure)
    • input (keyboard and mouse)
    • output (screen)
    • memory (DRAM, disks)
    • datapath
    • control

  • A computer system consists of the computer hardware plus the software. The conventional machine level instructions (corresponding to assembly language) is the interface (Figure 1.1).
• RISC vs CISC vs WISC

Read PH 4.1

• Positional number systems.

• Conversion from base b to decimal:
  • Arithmetic is in the destination base.
  • Write positional number as a polynomial and evaluate.

• Conversion from decimal to an arbitrary base (Horner's rule):
  • Arithmetic is in source base.
  • Use successive divisions by the base to split off digits from smallest to largest.

• For conversion from arbitrary base to another, use decimal as an intermediate base.

• For conversion from base $a$ to base $b$ where $an=\; b$, group the digits from right to left in groups of $n$ and convert. Similarly to convert from base $b$ to base $a$, expand each base $b$ digit into $n$ base $a$ digits.

• Device of the week: the mouse

  Try the following:

  • Move your mouse to the background and hold down the right mouse to bring up the Workspace menu.
  • Bring up the Workspace Properties
  • Select the Category Mouse
  • Experiment with settings of:
    • Mouse Acceleration
    • Mouse Threshold
    • Multi-Click Interval

• Addition and subtraction of unsigned numbers.

• Arithmetic on the circle.

• Introduction to signed numbers:
  • One's complement - used for signed integers on some early machines.
  • Two's complement - standard signed representation on commercial machines.
  • Sign-magnitude - used to represent mantissa of floating point numbers.

• Arithmetic using signed numbers.

• Signed and unsigned numbers in C.

  Try downloading and compiling this simple C program unsigned.c and experiment with the behavior of the unsigned int data type when a value is out of range.