A portable electronic device 14 wherein said locus of said frame buffer comprises a row of pixels of {HEAD ~ memory} within {TAIL ~ said frame buffer} 
A portable electronic device 14 wherein said locus of said frame buffer comprises a row of pixels of { HEAD ~ memory } within { TAIL ~ said frame buffer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL