=> R0 = 152 (&98)
R1 = buffer number
<= R0, R1 preserved
R2 = next byte in buffer, corrupted if buffer empty
C flag set if buffer is empty, otherwise clear
This call checks whether a given buffer is empty, and if a byte is available returns it without removing it from the 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 171
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