BE-2/4-Computer Organization - University Important Questions

Computer Organization Important Questions & Answers- Part-A -BE-II/IV Year Osmania University

One Course,One class can change everything if you are interested ..........

Good morning all,

"Even the greatest was once a beginner. Don't be afraid to take that first step even if things seem difficult in the beginning. That's only the initial impression. The important thing is not to retreat, you have to master yourself"

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CISCO- https://www.netacad.com/
Linkedin - https://www.linkedin.com/learning/    
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Canvas- https://www.mooc-list.com/initiative/canvas-network
Oxford Home Study -https://www.oxfordhomestudy.com/free-online-courses-with-certificates
Microsoft Learn- https://docs.microsoft.com/en-us/learn/
Coursera- https://www.coursera.org/courses?query=free
Bitdegree- https://www.bitdegree.org/free-certifications-online
Pluralsight- https://www.pluralsight.com/
Facebook Blueprint- https://www.facebookblueprint.com/student/catalog
Edx - https://www.edx.org/
Coursera- https://www.coursera.org/
Saylor.org- https://www.saylor.org/
Udacity - https://in.udacity.com/
Udemy - https://www.udemy.com/
Shaw Academy- https://www.shawacademy.com/
Skillsahre - https://www.skillshare.com/
Harvard University - https://online-learning.harvard.edu/
Futurelearn - https://www.futurelearn.com/
Future Learn - https://www.futurelearn.com/
Tuts Plus - https://tutsplus.com/
Open Culture - http://www.openculture.com
Khanacademy - https://www.khanacademy.org/
Alison - https://alison.com/
Open Learn - http://www.open.edu/openlearn/



I hope these links are useful for the students those who wants to jump-start their career in the industry.

Sandeep Ravikanti
Assistant Professor,
CSE,MCET.

LED DISPLAY INTERFACE

Aim:

To display 8086 number in a four seven segment Common Anode LED display.

Hardware and Software Required:

8086 kit, LED Display Unit

Hardware Description:

Seven segment displays are important display units in Electronics and widely used to display numbers from 0 to 9. It can also display some character alphabets like A,B,C,H,F,E etc

There are two types of 7 segment displays: Common Anode and Common Cathode:

Common Anode: In this all the Negative terminals (cathode) of all the 8 LEDs are connected together (see diagram below), named as COM. And all the positive terminals are left alone.

Common Cathode: In this all the positive terminals (Anodes) of all the 8 LEDs are connected together, named as COM. And all the negative thermals are left alone.

A table has been given below for all the numbers while using Common Anode 7 segment.

Digit to Display	h g f e d c b a	Hex code
0	11000000	C0
1	11111001	F9
2	10100100	A4
3	10110000	B0
4	10011001	99
5	10010010	92
6	10000010	82
7	11111000	F8
8	10000000	80
9	10010000	90

Code:

                         OUTPUT 2500AD

                         ORG 2000H

         

                         MOV DX,FFE6H            ;Configure all 8255 ports

                         MOV AL,80H              ;as output.

                         OUT DX,AL

         LOOP4:  MOV SI,2100H            ;Initialise pointer

          

         LOOP3:  MOV CH,04H              ;4 charecters/group

         LOOP2:  MOV BL,08H              ;8 segments/charecter

                        MOV AL,[SI]             ;get the display code

                        INC SI                  ;Increment pointer

         LOOP1: ROL AL,1                ;get 1 data bit

                MOV DX,FFE2H

                OUT DX,AL               ;o/p bit to portb

                MOV AH,AL

                MOV AL,01H              ;o/p clock to

                MOV DX,FFE4H            ;shift register

                OUT DX,AL

                DEC AL

                OUT DX,AL

                MOV AL,AH

                DEC BL                  ;all bits over?

                JNZ LOOP1               ;no,continue

                DEC CH                  ;all charecters over?

                JNZ LOOP2               ;no,continue                              

                CALL DELAY

                                        ;all groups over?

                ;JNZ LOOP3               ;no,continue

                JMP SHORT LOOP4

DELAY:          MOV CX,0FFFFH

XX:                 DEC CX        

                              JNZ XX

                RET

;Display code table

                ORG 2100H

        STRING:  DB 080H,0C0H,080H,080H

              

                END

Traffic Light Interface

Program

2.TRAFFIC  LIGHTS

; TRAFFIC LIGHT CONTROLLER INTERFACE

; The interface is connected over J4 of of trainer

; Traffic system moves from one state to other after a fixed delay

; This program starts at 2000H location

   OUTPUT  2500AD

        ORG     2000H

START:  MOV     AL,80H                 ; Initialisation of 8255 Mode 0

        MOV     DX,0FFE6H

        OUT     DX,AL                  ; All ports as o/p ports

AGAIN:  MOV     SI,2038H               ; Table of port values

NEXTST: MOV     AL,[SI]

        MOV     DX,0FFE0H

        OUT     DX,AL                  ; PortA value

        INC     SI

        ADD     DX,2

        MOV     AL,[SI]

        OUT     DX,AL                  ; PortB value

        INC     SI

        ADD     DX,2

        MOV     AL,[SI]

        OUT     DX,AL                  ; PortC value

        INC     SI

        CALL    DELAY                  ; Calling Delay routine

        CMP     SI,2044H               ; Checking for the end of the data values

        JNZ     NEXTST

        JMP     AGAIN

DELAY:  MOV     CX,0FFH                ; Delay routine

DLY5:   PUSH    CX

        MOV     CX,03FFH

DLY10:  NOP

        LOOP    DLY10

        POP     CX

        LOOP    DLY5

        RET

        ORG     2038H

        PORTVALUES:     DB      88H,83H,F2H               

                                      DB      38H,88H,F4H             

                                      DB      83H,88H,F8H              

                                      DB      88H,38H,F1H                

                                      DB      00H