=> R0 = flag byte
R1 = port number
R2 = station number
R3 = net number
R4 = pointer to data buffer
R5 = buffer size
R6 = retry count
R7 = delay in cs
<= R0 = status
R1 corrupted
R2 = pointer to buffer
R3 = station number
R4 = net number, or 0 if R3 on entry was the local net
This SWI creates a block and repeatedly polls until the data is received, or an error at which point the block is abandoned. As this SWI enables interrupts it should not be called from service or event handlers. It will loop in USR mode with IRQs enabled - a side effect is that callbacks may occur.
See PRM 2, page 661.
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