=> R0 = handle
R1 = timeout in cs
R2 = 0 if escape should not abort
<= 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 checks the port repeatedly until either aborted, or the data is received. The block will be abandoned after it has been received. As this SWI enables interrupts it should not be called from service or event handlers.
See PRM 2, page 654.
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