OSWORD &19

OSWORD &19 (25) - IP Network receive

This call is made by a modifed NFS to pass networking calls on to an IP networking handler. It should not be called directly by the user, programs should call OSWORD &11 and allow the networking system to forward the call to the appropriate handler.

Specification

   XY?0=0 - Open receive block
   On entry:
       XY?0   = 0
       XY?1   = must contain &7F
       XY?2   = port to receive on
       XY+3..4= station to receive from
       XY!5   = reception buffer start address
       XY!9   = reception buffer end address
   On exit:
       XY?0   = 0 if no more space to open blocks, or number of opened
              reception block. Receive blocks can be 'wild', ie will
              receive from anyone if the port or station values are set to
              &00.
   
   XY?0<>0 - Read and delete receive block
   On entry:
       XY?0   = receive block number to read
       XY!5   = receive buffer start address
       XY!9   = receive buffer end address
   On exit:
       XY?1   = flag from transmission block
       XY?2   = port received on
       XY+3..4= station received from
       XY!9   = updated to new address of buffer end

Unread receive blocks must be deleted with OSBYTE &34 (52).

See Also

• OSWORD &11 NetRx
• http://mdfs.net/Docs/Comp/BBC/Oswords

Networking calls
OSWORD &10 : Network transmit OSWORD &11 : Network receive OSWORD &12 : Read remote argument block OSWORD &13 : Read and Write local station information OSWORD &14 : Communicate with fileserver, etc.	OSBYTE &32 : Poll network transmit OSBYTE &33 : Poll network receive OSBYTE &34 : Delete receive control block OSBYTE &35 : Terminate remote connection

Jgharston 01:33, 19 December 2010 (UTC)