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: MoveMoveByteREAD: LoadByteAndECHO:Branch_if_[R4]=0LoadByteStoreByteAddLoadByteAndBranch_if_[R4]=0StoreByteR2, #LOCR3, #CRR4, KBD_STATUSR4, R4, #2READR5, KBD_DATAR5, (R2)R2, R2, #1R4, DISP_STATUSR4, R4, #4ECHOR5, DISP_DATABranch_if_[R5] [R3] READInitialize pointer register R2 to point to theaddress of the first location in main memorywhere 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 andincrement the pointer to main memory.Wait for the display to become ready.Check the DOUT flag.Move the character just read to the displaybuffer register (this clears DOUT to 0).Check if the character just read is theCarriage Return. If it is not, thenbranch back and read another character.

Start.Initialize pointer R2 to point to the user's name buffer.Load the ASCII code for Carriage…

Answered: Write a RISC-style program that…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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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.

Expert Solution

Step 1: Algorithm:

Start.
Initialize pointer R2 to point to the user's name buffer.
Load the ASCII code for Carriage Return into R3.
Display a prompt to enter the user's name.
Enter a loop to read characters from the keyboard until a Carriage Return is encountered.
Read a character from the keyboard, store it in memory, and display it.
Repeat step 5 until a Carriage Return is entered.
Display the entered characters on the screen.
End the program.

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