Agnus/ Read/ Denise/ Register Address Write Paula Function -------- ------- ----- ------- -------- VPOSR 004 R A( E ) Read vertical most significant bit (and frame flop) VPOSW 02A W A Write vertical most significant bit (and frame flop) BIT# 15,14,13,12,11,10,09,08,07,06,05,04,03,02,01,00 ----------------------------------------------- USE LOF-- -- -- -- -- -- --,-- -- -- -- -- -- -- V8 LOF=Long frame (auto toggle control bit in BPLCON0 )