Lecture Objectives

Lecture 24 Objectives

At the end of today's class you should

KNOW:

the basic architectural differences between the LC-3 and the x86 processors
the user-visible registers of the 8086 processor and what each register is used for
the way memory is organized on the 8086 processor
how an effective address is calculated on the 8086

BE ABLE TO:

describe several advantages and several disadvantages to learning x86 assembly language as a first assembly language
given the register contents of a program executing on the 8086, determine the 20-bit address of the next instruction to be fetched

Sample Exam Question:

Assume, at some point in the execution of a program running on the 8086, the segment registers and the IP have these hexadecimal values:

CS  1234
DS  5678
ES  ABCD
SS  1001
IP  4212

From which (hexadecimal) address will the next instruction be fetched?