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