Write an program in assembly language to read a letter entered by a user. The program should display an enlarged version of a given letter on the screen. The program should also do the following:

Clear the screen and change the screen colour to yellow on blue

Change the cursor position to row 10, column 0

Prompt the user to key in an upper case letter (A-E). Read the letter from the keyboard.

Test whether the letter is in range (A, ..., E). Display an error message if the letter is out of range and terminate the program.

Display an enlarged version of the letter on the screen.

Define a bit pattern for each letter and use this pattern to display the individual lines:

For example: for the letter B displayed, you should define a string of 7 hex numbers, one hex number for each line.

To display the first line, step through the bit pattern, displaying a space if the bit is equal to zero and displaying a '$' otherwise. Write a carriage return and line fees to the screen and move to the pattern for the next line. Display all 7 lines of the enlarged letter.

Example: if the user enters B, the following pattern is displayed:

Enlarged Letter Bit Pattern Hex Number Line Number

$$$$ 11110 1E 1

$ $ 10001 11 2

$ $ 10001 11 3

$$$$ 11110 1E 4

$ $ 10001 11 5

$ $ 10001 11 6

$$$$ 11110 1E 7

Mark allocation: clearing screeen , changing screen colour and setting cursor position (3)

displaying user prompt (1)

Readig the letter (ASCII character) (2)

testing the range and displaying an error message if the letter is out of range (3)

definition of bit patterns (5)

displaying the lines corresponding to the bit pattern of the letter entered (6)

A program listing submitted (5)

Three screen shots of test cases submitted (3x5)

program structure (5)

program documentation / comments (5)