NASM Assembly EXPERTS! Please help! Question on colour change on screen & bit pattern

[AshleyDBN]

Write a program in IBM PC assembly language to do the following:
1. Clear the screen and change the colour of the screen to blue (foreground) on white (background). (See
INT 10 function).
2. Set the cursor to line 12, column 10. (See INT 10 function).
3. Read one character from the keyboard. You must consider the characters ‘A’ to ‘E’ as valid input
characters. Display an error message if the input character is invalid.
4. Use bit patterns to enlarge the given character and display it on the screen. Eg. if ‘A' is input, the
following pattern must be displayed on the screen:
(line 1): ***
(line 2): * *
(line 3): *****
(line 4): * *
(line 5): * *
HINT: The first line of this pattern can be represented as the bit pattern 01110000 (70h). Write down a set of bit
patterns, one for each line of the enlarged character. Thus the set of bit patterns for each character forms a
matrix. To display, step through the bit pattern for each line. If the bit is 1, display a ‘*’, else display a space
(20h). You can make use of the RCL instruction.