Computer Science 220
Assembly Language & Computer Architecture

Fall 2010, Siena College

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Agenda

• Announcements
• Lab 4 due Tuesday
• Exam 1 recap
• Digital logic basics
  • resistors and transistors
  • the inverter
  • NOR and NAND
  • digital logic gate abstractions
  • universality of gates
  • representing mathematical functions
  • multi-input gates
  • simplification of circuits

Lecture Assignment 0b

Due at the start of class, Tuesday, October 19.

Please submit answers to these questions either as a hard copy (typeset or handwritten are OK) or by email to jteresco AT siena.edu by the start of class. We will discuss these questions at the start of class, so no late submissions are accepted.

1. We constructed a NAND gate from two transistors in series. What function of three inputs is obtained by placing three transistors in series?
   
2. Show that the NOR gate is universal by building circuits to compute NOT, AND, and OR using only NOR gates.