Screen not Full black

[Matheus]

In the exercise Fill, the Screen is suppose to get totally black right? i'm getting just few lines black, from top to bottom, but just a line. The program is fine, it goes all the way down on the RAM map writing, and cleaning when no key pressed, i guess.

[Matheus]

Nevermind. Find my error, im suppose to write -1, that means 11111111, and not 1, that would be 00000001. That explain the line x(