1. [M] Write a CISC-style program for the task in Problem 3.21.
2. [D] Write a RISC-style program that displays a string of characters centered horizontally
on a standard 80-character line and enclosed in a box, as shown below:
The string of characters is located in the main memory beginning at address STRING. There is a NUL control character (value 0) at the end of the string of characters. If the string has more than 78 characters (including spaces), the program should truncate the displayed string to 78 characters. The program for determining the length of a character string in Example 2.1 can be adapted as a subroutine for use by the program in this problem. Assume that the display device has the interface depicted in Figure 3.3.
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