Assembler Answers

(a) Assemble the following instructions and show the changes in given Accumulator register and flags after each instruction execution.

MOV AL, 8Bh ; CF = ?, SF = ?, PF = ?, ZF = ?

ADD AL, 22h ; CF = ?, SF = ?, PF = ?, ZF = ?

AND Al, 1000101b ; CF = ?, SF = ?, PF = ?, ZF = ?

OR Al, 9Ah ; CF = ?, SF = ?, PF = ?, ZF = ?

XOR AL, 10101011b ; CF = ?, SF = ?, PF = ?, ZF = ?

TEST AL, 2 ; CF = ?, SF = ?, PF = ?, ZF = ?

CMP AL, 58 ; CF = ?, SF = ?, PF = ?, ZF = ?

ADC AL, 11110000b ; CF = ?, SF = ?, PF = ?, ZF = ?

SHR AL,2 ; CF = ?, SF = ?, PF = ?, ZF = ?
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b)
Write a subroutine that can calculate the sum of an array and also save the result into DX.
( Array’s length is 20)
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Consider the following AVR Assembly Language Code which is passed through an assembler.

.include "m64def.inc"
jmp RESET
jmp HANDLER_1

.dseg
var1: .BYTE 1
var2: .BYTE 3


.cseg
const: .DB 0xAA, 0xCC
.org 0x20
reset:
ldi ZL, low(var1)
ldi ZH, high(var1)
ldi r17, 0xBB
st Z, r17
ldi ZL, low(const<<1)
ldi ZH, high(const<<1)
lpm
.dseg
var3: .BYTE 4
.cseg
mainloop:
ldi r20, 0xF0
...

Determine the segments and values of each of the following symbols. (Enter the segment as either "cseg" or "dseg" - without the quotes. Enter the values as decimal integers.).
Symbol Segment Value
var1
var3
reset
const
mainloop
(This is a table - fill it in)

Hi , I wrote this assembly code in TASM but when "CL=11" output is "0;" .
What is wrong in this code??? (And sorry for my bad english (((((-: )

MOV AL,CL
MOV AH,0
I DB 10
DIV I
MOV BL,AL
MOV BH,AH
ADD BL,48
ADD BH,48
MOV AH,02
MOV DL,BH
INT 21H
MOV DL,BL
INT 21H

Let us assume that a program takes 400 seconds of elapsed time to execute. Out of these 400 seconds, 320 seconds is the CPU time and the rest is I/O time. What percentage of elapsed time is spent on I/O operations?

Let us have a 20MIPS processor, you have to calculate the percentage of time it spends in busy wait loop of a 75-character line printer, when it takes 2 msec to print a character and a total of 665 instructions require to be executed to print a 75 character line.

Suppose that two instructions are executed in the polling loop.

hi i am a beginners in mips and we're given a homework to convert binary string into decimal
Objective: Introduce student to MIPS programming and the use of MIPS operations.

Weight: This assessment will be worth 3% of the whole course.

Due Date: April 16th 2011.

Main Task: Design and Implement a MIPS program that will convert a binary string into decimal.

Criteria

1. Prompt user to input a binary string of no more that 8 bits.- 10 pts
2. Verify if user input was all binary.(Prompt again if entry was wrong) - 30pts
3. Should contain at least 1 function. -10 pts
4. Should be commented to explain purpose of instructions. -10 pts
5. Calculate and display the correct answer for the user. - 40 pts


this is my code and i am so confused i really need help pls tell me what to do step by step because this is very hard for me as a beginner

.text
.align 2

# Let X be a binary number, n digits in length, compose of bits X n-1
#Let D be a decimal number
#Let i be a counter


main: li $v0, 4 #code for print string
la $a0, prompt #load address of prompt into $a0
syscall #print the prompt message

la $t3, True
lw $t5, 0($t3)
la $t3,False
lw $t6, 0($t3)
li $v0, 8 #code for read strings
la $a0, binary #addr of buffer (binary)
li $a1, 9 #size of buffer (1 byte)
syscall #

lw $t4, 0($a0)
lw $t6, 4($a0)
lw $t7, 8($a0)
lw $t8, 12($a0)
lw $t9, 16($a0)





Loop: beg $t4, $t5, convert





convert:





.data

prompt: .asciiz "Please Input a Binary String \n"

Hi. Can you do MIPS programming assignment?

Thanks
JC

Suppose that a certain program takes 500 seconds of elapsed time to execute. Out of these 500 seconds, 280 seconds is the CPU time and the rest is I/O time. What will be the I/O time?

What percentage of time will a 20 MIPS processor spend in the busy wait loop of 65-character line printer when it takes 3 m-sec to print a character and a total of 457 instructions need to be executed to print 65 character lines? Assume that 4 instructions are executed in the polling loop?