This locus may be, in various embodiments herein, a single pixel, a row of pixels, or {HEAD ~ a number} of {TAIL ~ rows} of pixels of frame buffer memory 
of
This locus may be , in various embodiments herein , a single pixel , a row of pixels , or { HEAD ~ a number } of { TAIL ~ rows } of pixels of frame buffer memory
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH