726 IF AS=1 AND I=6 THEN POKE &H1C6,160:POKE &H669,108:POKE &H66A,1 'bypass AVT frame SYNC to avoid weak signal hangup in mode 97
727 IF AS=1 AND I=5 THEN POKE &H1C6,160:POKE &H669,174:POKE &H66A,0 'bypass AVT frame sync-&h669 and 66a are LSB/MSB for pixel delay b4 start pix in mode 97
730 LLB=INT(LL/256):LLA=LL-256*LLB 'LL=bytes per line for mode
735 KEY 10,"system"+CHR$(13)
740 LTB=INT(LT/256):LTA=LT-256*LTB 'line timing per lines 3000-5000