Display

The display is a 64x32 pixel monochrome output of the program is running. The data location of the screen sits from 0xF00 to 0xFFF in ram. Each row is represented by 8 bytes.

0xF00 .. 0xF07
0xF08 .. 0xF0F
0xF10 .. 0xF17
.
.
0xFE8 .. 0xFEF
0xFF0 .. 0xFF7
0xFF8 .. 0xFFF

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Draw

The draw opcode (0xDxyn) is passed 3 variables.
x represents the the register index that contains the x coordinate.
y represents the the register index that contains the y coordinate.
n is the number of rows to print of the sprite.

The function will xor the sprite at location I to the current display starting at bit x, y. If any value goes from set to unset during the xor the V_f shall be set to 1.
Sprites that go outside the boundaries wrap around to the other side.