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Articles by Rishi Rathor
Page 8 of 10
Control register of 8257
The processor, in active state writes to the Control register of 8257 to configure its working purpose. To find out the status of 8257, the processor reads status register of the processor. The control register is of length 8-bits which is only read by the processor but not read. It is only selected when CS* is 0, A3-0 is 1000, and IOW* is 0.Intel calls the control register 8257 normally the mode set register by as it sets the mode of operation of 8257.AULD1 = Enable auto load0 = Disable auto loadTCS1 = Stop DMA transfer if TC reached0 = ...
Read MoreProgramming the 8253
According to the microprocessor point of view, the 8253 is designed and has some specialty port chip I/O. We don't use it for interfering the I/O devices. For performing the application of time it is used. 8253 has the addressed A1 and A0 input pins.The counters have width of 16 bits. If they were 8-bits wide, the delay in time that would be generated is very small. The Least Significant Byte and the Most Significant Byte of a counter is selected by using the same address of the port.The processor here writes to the control port to configure the working of ...
Read MoreCreate a table in MySQL that matches another table?
To create a table in MySQL that matches with another table, use CREATE TABLE command with LIKE operator. The syntax is as follows −create table yourNewTableName like yourOldTableName;The above syntax creates structure of the table.If you want all records then use INSERT INTO…...SELECT *FROM command. The syntax is as follows −insert into yourNewTableName select *from yourOldTableName.I have an old table and some data −mysql> create table WholeWordMatchDemo −> ( −> Words varchar(200) −> ); Query OK, 0 rows affected (0.84 sec)First, we will create a table structure. The query is as ...
Read MoreWhat is "Processing Symbol Files" message in Xcode?
Processing symbol files is a message displayed on xcode when we create a project’s build. When this message appears, in background Xcode downloads files and symbol files for specific device and a specific processor on which build shall be installed.The symbol files contains debug symbols which are used to debug on specific processor and iOS version and when some crash or error occurs, those symbols are used to create crash reports. Once processing symbols is done a new folder with device symbols is created in the library, usually under “~/Library/Developer/Xcode/iOS DeviceSupport/ “.Sometimes our system might get stuck on this step ...
Read MoreWhich MySQL type is most suitable for "price" column?
The best type for price column should be DECIMAL. The type DECIMAL stores the value precisely.For Example - DECIMAL(10, 2) can be used to store price value. It means the total digit will be 10 and two digits will be after decimal point.To understand the type DECIMAL, let us create a table.mysql> create table PriceDemo −> ( −> ProductPrice DECIMAL(10, 2) −> ); Query OK, 0 rows affected (0.60 sec)Now insert some records in the table in the form of price. The query to insert records is as follows −mysql> insert into PriceDemo values(12345.67); Query OK, 1 row ...
Read MoreHow to programmatically add a UISegmentedControl to a container view?
To add a UISegmentControl in iOS with swift we’ll have to first create a segment control and it’s controller function, i.e. it’s action. Let’s see those steps.Let’s create a function to add a segmented control.func addControl() { let segmentItems = ["First", "Second"] let control = UISegmentedControl(items: segmentItems) control.frame = CGRect(x: 10, y: 250, width: (self.view.frame.width - 20), height: 50) control.addTarget(self, action: #selector(segmentControl(_:)), for: .valueChanged) control.selectedSegmentIndex = 1 view.addSubview(control) }This function may be called in our view controller to add the segmented control, let’s add action for ...
Read MoreCan we use str_replace in MySQL?
The str_replace version in MySQL is the replace() function. Let us first create a table to understand the function −mysql> create table StringReplaceDemo −> ( −> Id int, −> URL varchar(200) −> ); Query OK, 0 rows affected (0.38 sec)Insert some records in the table with the help of insert command. The query is as follows −mysql> insert into StringReplaceDemo values(1001, 'https://www.google.co.in'); Query OK, 1 row affected (0.09 sec) mysql> insert into StringReplaceDemo values(1002, 'https://www.facebook.com'); Query OK, 1 row affected (0.11 sec) mysql> insert into StringReplaceDemo ...
Read MoreMySQL BigInt zerofill vs int zerofill?
The difference between MySQL BigInt and int is that INT is a 32-bit long while BIGINT is 64-bit long.The following are some of the points −The BigInt takes 8 bytes of storage while int takes 4 bytes of storage.The int takes 4294967295 maximum values for int(10), whereas 18, 446, 744, 073, 709, 551, 615 for the bigint(20).The BigInt(20) and int(10), in this 20 and 10 can be used for width display with zerofill.Here is the demo of Bigint and int with zerofill. The following is the query to create a table.mysql> create table BigintandintDemo −> ( ...
Read MoreProgram to Find the largest number in an array of data in 8085 Microprocessor
In this program we will see how to find the largest number from a block of bytes using 8085.Problem StatementWrite 8085 Assembly language program to find the largest number from a block of bytes.DiscussionIn this program the data are stored at location 8001H onwards. The 8000H is containing the size of the block. After executing this program, it will return the largest number and store it at location 9000H.Logic is simple, we are taking the first number at register B to start the job. In each iteration we are getting the number from memory and storing it into register A. ...
Read More8085 program to add two 16 bit numbers
In this program we will see how to add two 16-bit numbers.Problem StatementWrite8085 Assembly language program to add two 16-bit number stored in memory location 8000H – 8001H and 8002H – 8003H.DiscussionIn this program we are pointing the operand addresses using HL and DE register pair. Then adding LSBytes by ADD operator, and after that adding MSBytes using ADC operator to consider the carry flag result. The 16-bit result will be stored at BC register, and by checking the carry bit after addition we can simply put 1 into memory.We are taking two numbersBCAD + FE2D = 1BADAInputAddressData......8000AD8001BC80022D8003FE......Flow DiagramProgramAddressHEX CodesLabelsMnemonicsCommentsF00021, ...
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