Project 7

In this project we write our first assembler programs (Chapter 4 of the book).

There are three tasks:

• Mult.asm
  This program computes the value R0*R1 and stores the result in R2. We assume that R0>=0, R1>=0, and R0*R1<32768. Your program need not test these conditions, but rather assume that they hold.
• Fill.asm
  This program runs an infinite loop that listens to the keyboard input. When any key is pressed, the program blackens the screen, that is, it writes "black" in every pixel; the screen remains fully black as long as the key is pressed.
  When no key is pressed, the program clears the screen, that is, it writes "white" in every pixel; the screen remains fully white as long as no key is pressed.
• Diagonal.asm
  This program draws a single diagonal line, from the top-right corner of the screen to the bottom-left corner of the screen.
  Since the screen size is 256x512 pixels, this means that every row contains exactly two black pixels. For instance, the following pixels are all black:
  (0,511), (0, 510), (1, 509), (1, 508), (2, 507), ... , (254, 3), (254, 2), (255, 1), (255, 0)

You can find more details about the first two tasks on the Nand2Tetris page. It also has tips on testing and debugging your programs.

You should upload each source file individually to our submission server.