=> R0 = 145 (&91)
R1 = buffer number
<= R0, R1 preserved
R2 = byte removed
C flag set if buffer was empty on entry
clear if byte was successfully removed
This call extracts the next byte from the given buffer. The buffer number is not validated - undefined results (rather than an error) occur if a bad buffer number is passed.
See PRM 1, page 170
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