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Articles by Chandu yadav
Page 47 of 81
Slave register in 8259
It is also an 8-bit register. The processor here writes to SLR but cannot read. The content of this register here implies a different meaning for Master8259 and Slave 8259. Through Master 8259 information is carried through the IR inputs to which Slave 8259s are connected. If the SLR of Master 8259 is loaded with the value 00001111, then it signifies that:The Slave exists on 8259 namely called as IR0, IR1, IR2 and IR3.No Slave exists on 8259 on this registers IR4, IR5, IR6 and IR7.A Slave 8259 serves information about the IR input of Master 8259 to which the ...
Read More8085 Program to find Square of a number using look up table
Now let us see a program of Intel 8085 Microprocessor. This program is mainly for finding a square of a number.Problem StatementWrite 8085 Assembly language program to find the square of a number using Look-Up Table. DiscussionIn this example, we are using Look-Up table to find the square of a number. The main limitation of this program is that it can find a square in range 0-F. When the input is above F, it will fail. We are storing the square result into the memory. When the number is greater than F, we are storing FFH into memory to indicate an ...
Read More8085 Program to Subtract two 8 Bit numbers
In this program, we will see how to subtract two 8-bit numbers using 8085 microprocessor.Problem StatementWrite 8085 Assembly language program to subtract two 8-bit numbers and store the result at locations 8050H and 8051H.DiscussionIn 8085, the SUB instruction is used 2’s complemented method for subtraction. When the first operand is larger, the result will be positive. It will not enable the carry flag after completing the subtraction. When the result is negative, then the result will be in 2’s complemented form and carry flag will be enabled. We are using two numbers at location 8000H and 8001H. When the numbers are ...
Read More8085 Program to Divide two 8 Bit numbers
In this program, we will see how to divide two 8-bit numbers using 8085 microprocessor.Problem StatementWrite 8085 Assembly language program to divide two 8-bit numbers and store the result at locations 8020H and 8021H.DiscussionThe 8085 has no division operation. To get the result of the division, we should use the repetitive subtraction method. By using this program, we will get the quotient and the remainder. 8020H will hold the quotient, and 8021H will hold the remainder.We are saving the data at location 8000H and 8001H. The result is storing at location 8050H and 8051H.InputThe Dividend: 0EHThe Divisor 04HThe Quotient will be ...
Read MoreCheck if the String contains only unicode letters in Java
In order to check if a String has only Unicode letters in Java, we use the isDigit() and charAt() methods with decision-making statements.The isLetter(int codePoint) method determines whether the specific character (Unicode codePoint) is a letter. It returns a boolean value, either true or false.Declaration −The java.lang.Character.isLetter() method is declared as follows −public static boolean isLetter(int codePoint)Here, the parameter codePoint represents the character to be checked.The charAt() method returns a character value at a given index. It belongs to the String class in Java. The index must be between 0 to length()-1.Declaration −The java.lang.String.charAt() method is declared as follows −public ...
Read MoreDecimal Number System
Number System represents value of number with respect to its given base. Based on its Base value, a number has unique representation and different number systems have different representation of the same number. For example, Binary, Octal, Decimal and Hexadecimal Number systems are used in microprocessor programming.If the Base value of a number system is 10, then it is called Decimal number system which has most important role in the development of science and technology. This is the weighted (or positional) number representation, where value of each digit is determined by its position (or their weight) in a number. This ...
Read MoreHigh-level file operations in Python (shutil)
A number of functions for hgh level operations on files and directories have been defined in shutil module of Python’s standard library.copy()This function copies a file to a specified file in same or other directory. First parameter to the function is a string representation of existing file. Second argument is either name of resultant file or directory. If it is a directory, the file is coped in it with same name. The metadata of original file is not maintained.>>> import shutil >>> shutil.copy("hello.py", "newdir/") 'newdir/hello.py'copy2()This function is similar to copy() function except for the fact that it retains metadata of ...
Read MoreInsert NULL value into INT column in MySQL?
You can insert NULL value into an int column with a condition i.e. the column must not have NOT NULL constraints. The syntax is as follows.INSERT INTO yourTableName(yourColumnName) values(NULL);To understand the above syntax, let us first create a table. The query to create a table is as follows.mysql> create table InsertNullDemo -> ( -> StudentId int, -> StudentName varchar(100), -> StudentAge int -> ); Query OK, 0 rows affected (0.53 sec)Here is the query to insert NULL whenever you do not pass any value for column. Here this column is StudentAge. MySQL inserts null value by default. The query to ...
Read MoreSELECT increment counter in MySQL?
To select increment counter in MySQL, first you need to declare and initialize a variable. The syntax is as follows −set @anyVariableName=0; select yourColumnName, @anyVariableName:=@anyVariableName+1 as anyVariableName from yourTableName;To understand the above syntax and set an increment counter, let us first create a table. The query to create a table is as follows.mysql> create table incrementCounterDemo -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (1.01 sec)Insert some records in the table using insert command. The query is as follows.mysql> insert into incrementCounterDemo values('John'); Query OK, 1 row affected (0.18 sec) mysql> insert into incrementCounterDemo values('Carol'); ...
Read MoreMySQL update with random number between 1 - 3
The syntax for updating a column with random number between 1-3 is is as follows −update yourTableName set yourColumnName=FLOOR(1+RAND()*3);To understand the above syntax, let us first create a table. The query to create a table is as follows −mysql> create table UpdateNumber1To3 -> ( -> MyNumber int -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into UpdateNumber1To3 values(100); Query OK, 1 row affected (0.16 sec) mysql> insert into UpdateNumber1To3 values(140); Query OK, 1 row affected (0.25 sec) mysql> insert into UpdateNumber1To3 values(130); ...
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