Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Concept explainers

Computer Fundamentals
The computer is termed computation. For calculating or computing something the device that has been used is known as the computer. Or we can say that for performing a fast arithmetic operation the device that has been used is a computer. Storing, process…
Question

Write a RISC-style program that displays the name of the user backwards.  The program should display a prompt requesting that the characters in the user’s name be entered on the keyboard, followed by the carriage return (CR). The program should accept a sequence of characters and store them in the main memory. It should then display a message to indicate that the user’s name will be displayed backwards, followed by the display of the characters from the user’s name in reverse order.

Use the following code as guidance:

 

Move MoveByte READ: LoadByte And ECHO: Branch_if_[R4]=0 LoadByte StoreByte Add LoadByte And Branch_if_[R4]=0 StoreByte R2, #LOC R3, #CR R4, KBD_STATUS R4, R4, #2 READ R5, KBD_DATA R5, (R2) R2, R2, #1 R4, DISP_STATUS R4, R4, #4 ECHO R5, DISP_DATA Branch_if_[R5] [R3] READ Initialize pointer register R2 to point to the address of the first location in main memory where the characters are to be stored. Load ASCII code for Carriage Return into R3. Wait for a character to be entered. Check the KIN flag. Read the character from KBD_DATA (this clears KIN to 0). Write the character into the main memory and increment the pointer to main memory. Wait for the display to become ready. Check the DOUT flag. Move the character just read to the display buffer register (this clears DOUT to 0). Check if the character just read is the Carriage Return. If it is not, then branch back and read another character.
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Transcribed Image Text:Move MoveByte READ: LoadByte And ECHO: Branch_if_[R4]=0 LoadByte StoreByte Add LoadByte And Branch_if_[R4]=0 StoreByte R2, #LOC R3, #CR R4, KBD_STATUS R4, R4, #2 READ R5, KBD_DATA R5, (R2) R2, R2, #1 R4, DISP_STATUS R4, R4, #4 ECHO R5, DISP_DATA Branch_if_[R5] [R3] READ Initialize pointer register R2 to point to the address of the first location in main memory where the characters are to be stored. Load ASCII code for Carriage Return into R3. Wait for a character to be entered. Check the KIN flag. Read the character from KBD_DATA (this clears KIN to 0). Write the character into the main memory and increment the pointer to main memory. Wait for the display to become ready. Check the DOUT flag. Move the character just read to the display buffer register (this clears DOUT to 0). Check if the character just read is the Carriage Return. If it is not, then branch back and read another character.
Expert Solution
Check Mark
Step 1: Algorithm:
  1. Start.
  2. Initialize pointer R2 to point to the user's name buffer.
  3. Load the ASCII code for Carriage Return into R3.
  4. Display a prompt to enter the user's name.
  5. Enter a loop to read characters from the keyboard until a Carriage Return is encountered.
  6. Read a character from the keyboard, store it in memory, and display it.
  7. Repeat step 5 until a Carriage Return is entered.
  8. Display the entered characters on the screen.
  9. End the program.
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