=> R0 = handle
<= R0 = status
R1 = 0, or flag byte if r0=9 on exit
R2 = port number
R3 = station number
R4 = net number
R5 = pointer to data buffer
R6 = size of buffer (or size of data received if r0=9 on exit)
This SWI returns information about the control block it abandons.
See PRM 2, page 683.
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