1. Computer Organization & Assembly Language
Lecture # 9
By Muhammad Jafer

2. Quiz (15-15) What is pipelining. How inlet Implemented pipelining
Calculate Physical Address for each instructions.
What will be the value of AX, AH, AL, IP & CS after executing the last instruction
Logical Address
CS:IP
Assembly Language
1ABC:0000
MOV AX, 99D
xxxx:0100
ADD Al,A2
xxxx:010A
SUB Al,02
xxxx:0200
ADD AX,FF10

3. STACK Temporary memory for Processors Stored in RAM
Importance & alternate of Register-Register Design
Every Register can be stored except SS&SP
Logical Addresses VS Physical Addresses
SS:SP
Overlapping
Intel Architecture Stack
Increments and then add
Show & decrement
Stack Pointer

4. Flag Registers Conditional Flags CF PF AF ZF SF OF Control Flags TF IFDF

5. X86 Addressing Modes Register Address Mode MOV BX,DX Immediate Mode
MOV AX,2550H
Direct Mode
MOV AX,[2550]
Register Indirect Addressing Mode
MOV AL,[BX]
Based Relative Addressing Mode
MOV CX,[BX]+10
Based Index Addressing Mode
MOV CX,[BX][DX]+10
Segment Overrides

6. Chapter Review
The x86 PC Assembly Language, Design & Interfacing by Muhammad Ali Mazidi, Janice Gillispie Mazidi & Danny Causey
Chapter # 1
The Stack
Flag Registers
X86 Addressing Modes

7. Assembly Program Concepts
[label:] mnemonic [operands] [;comments]
Mnemoics can be directives
Directive give direction to assembler
Assembly Program
Model Definition
Segment Definition
.STACK
.DATA
.CODE

8. MODEL DEFINITION .MODEL SMALL How much space is required MEDIUM
>64k for memory
COMPACT
>64k for data
LARGE
>64k for both but one at a time
HUGE
>64k for both at same time
TINY
>COM File concepts (Will not be used in this course)

9. Segmentation DEFINITION
Can work with only one segment.
Good programing practices
.STACK 64k
.DATA
[label/Name] [length] [values]
DATA1 DB 55H
DATA2 DW ?
.CODE
MOVE

10. Chapter Review
The x86 PC Assembly Language, Design & Interfacing by Muhammad Ali Mazidi, Janice Gillispie Mazidi & Danny Causey
Chapter # 2
Directives & A Sample Program