=> R0 = 2
R2 = device driver stream handle
<= R0 = 0 if you wish to remain dormant
2 if you are ready to transmit
This entry point is called when DeviceFS has data ready to transmit. If you wish to wake up transmit data you should call DeviceFS_TransmitCharacter to obtain bytes to send.
See PRM 2, page 600.
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