=> R0 = buffer number
<= R0 = flags
R1 = pointer to buffer start
R2 = pointer to buffer end
R3 = insertion offset
R4 = removal offset
R5 = bytes free
R6 = bytes used
This SWI reads information about a particular buffer. Insertion and removal points wrap around, and the sum of free space and characters may not equal total buffer size.
See PRM 4, page 97.
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