(Simpletron Simulator Modifications) In Exercise, you wrote a software simulation of a com...

(Simpletron Simulator Modifications) In Exercise, you wrote a software simulation of a computer that executes programs written in Simpletron Machine Language (SML). In this exercise, we propose several modifications and enhancements to the Simpletron Simulator. In the exercises of Chapter 21, we propose building a compiler that converts programs written in a high-level programming language (a variation of Basic) to Simpletron Machine Language. Some of the following modifications and enhancements may be required to execute the programs produced by the compiler:

a) Extend the Simpletron Simulator's memory to contain 1,000 memory locations to enable the Simpletron to handle larger programs.

b) Allow the simulator to perform remainder calculations. This modification requires an additional SML instruction.

c) Allow the simulator to perform exponentiation calculations. This modification requires an additional SML instruction.

d) Modify the simulator to use hexadecimal rather than integer values to represent SML instructions.

e) Modify the simulator to allow output of a newline. This modification requires an additional SML instruction.

f) Modify the simulator to process floating-point values in addition to integer values.

g) Modify the simulator to handle string input. [Hint: Each Simpletron word can be divided into two groups, each holding a two-digit integer. Each two-digit integer represents the ASCII (see Appendix B) decimal equivalent of a character. Add a machine-language instruction that will input a string and store the string, beginning at a specific Simpletron memory location. The first half of the word at that location will be a count of the number of characters in the string (i.e., the length of the string). Each succeeding half-word contains one ASCII character expressed as two decimal digits. The machine-language instruction converts each character into its ASCII equivalent and assigns it to a half-word.]

h) Modify the simulator to handle output of strings stored in the format of part (g). [Hint: Add a machine-language instruction that will display a string, beginning at a certain Simpletron memory location. The first half of the word at that location is a count of the number of characters in the string (i.e., the length of the string). Each succeeding halfword contains one ASCII character expressed as two decimal digits. The machine-language instruction checks the length and displays the string by translating each two-digit number into its equivalent character.]