=> R1 = buffer number
R9 = 22, &16 (vector number)
flags V set to flush buffer
V clear C set to return free space
V clear C clear to return entries
<= R0 corrupt
If purge:
R1 preserved
R2 preserved
If count:
R1 = count AND &FF
R2 = count >> 8
If called via OS_CallAVector then interrupts must be disabled first.
See PRM 1, page 82.
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