Output bitmap

[acea12321]

Can someone please explain how this bitmap decides which pixels are on?
Thank you

[cadet1620]

Words in the screen memory each control 16 pixels. Screen[0] controls the leftmost 16 pixels of the top row, Screen[1] the next 16 pixels, etc.

For each word, the least significant bit controls the left-most bit of the 16-bit group. Example Screen[0]=1 tunrs on the upper-left screen pixel.

--Mark