- stop drawing if the y position is outside of the visible screen. Some graphics   modes have caused a segmentation fault in that case (e.g. CGA 320x300x4)
- stop drawing if the y position is outside of the visible screen. Some graphics
  modes have caused a segmentation fault in that case (e.g. CGA 320x300x4)

marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet