CPU

Program description

To use this program, you need to write code to a file asm.txt, in this case, the code must be written using a specific syntax:

1. CRT (create) is a command that should be written at the beginning of the program code, it creates a stack for the processor;
2. IN - command to enter a number from the keyboard (the number is put on the processor stack);
3. • PUSH 0 - puts the number 0 on the processor stack;
   • PUSH ax - puts a number from the ax register on the processor stack;
   • PUSH [1] - puts a number from RAM at address 1 on the processor stack;
   • PUSH [ax] - puts a number from RAM to the address ax;
4. ADD - adds two numbers from the processor stack and puts the result back;
5. SUB - subtraction;
6. MUL - multiplication;
7. DIV - division;
8. OUT - takes an element from the processor stack and displays it on the screen;
9. HLT is a command that is written at the end of the program, it clears the memory that the processor stack occupied;
10. POP - command is an analog of PUSH, which takes an element from the processor stack and puts it in a register or RAM;
11. :label - label;
12. JMP label - switch to label label;
13. JA label - switch to label label if the penultimate number in the processor stack is greater than the last one;
14. JAE label (>=);
15. JB label (<);
16. JBE label (<=);
17. JE label (==);
18. JNE label (!=);
19. CALL nameFunction - the command switches to the nameFunction label, and the execution of the function code begins;
20. RET is a command that is written inside a function that starts with the nameFunction label and returns the execution of the program to the command following the CALL nameFunction command;
21. SQRT is a square root command that takes the last number from the processor stack and returns the result of the operation in its place;
22. DRAW - command to draw the contents of RAM;
23. MOVE - movement command (experimental command that needs improvement);
24. P_CDOT - is a command that displays the character '*';
25. P_SPACE - a command that displays the symbol ' ';
26. NEW_LINE - a command that moves the cursor to a new line.

Assembler/main.cpp - a file that converts code from a file asm.txt in binary code and writes it to a file code.txt.

CPU/main.cpp - a file that executes code from a file code.txt and displays the result of the program on the screen.

Disassembler/main.cpp - a file that converts binary code from a code file.txt into the program text and writes it to a file asm.txt (the code of this program is proposed to be written to the reader as a training task).

Using the program

You can only call the execution of a file CPU/main.cpp , since programs are called inside this program Assembler/main.cpp and Disassembler/main.cpp using the system() function, which is done for the convenience of the user.

Additional information

include/ is a folder with header files *.h that are used inside programs.
testPrograms/ is a folder with examples of programs written using the syntax described above.