=> R0 = character
R1 = string address
<= R0 and flags corrupted.
R1 updated until after the character
This inserts a single character into a string of r_data format. If R0 = 0
then it inserts 0,0 and if R0 >= &100 then it inserts 0,3,x,y where R0 =
&yyxx. Otherwise it just inserts the byte as normal.
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