Using fork and pipe, replicate a OS where the parent (CPU) is fetching from the child (Memory)

[login to view URL] Tests the indexed load instructions. Prints two tables, one of A-Z, the other of 1-10. [login to view URL] Tests the call/ret instructions. Prints a face where the lines are printed using subroutine calls. [login to view URL] Tests the int/iret instructions. The main loop is printing the letter A followed by a number that is being periodically incremented by the timer. The number will increment faster if the timer period is shorter. [login to view URL] Tests the proper operation of the user stack and system stack, and also tests that accessing system memory in user mode gives an error and exits.