using DA it won't work. Da pack two ascii character in a 14bit packet... 2X7Bits
$FE (wich should be write h'FE') is over the 127 dec or 7F Hex.

What you can do is to use something else something like
Code:
DA "first line",1,2,"Second Line",0
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.
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If char = 1 then char = $FE
If char = 2 then char = $C0