the excel sheet that I posted here: http://voxcommando.com/forum/index.php?topic=766.msg6035#msg6035 is fairly comprehensive.  Same source as your first link I believe.

The document is from 2007 so you may need to experiment with the inputs.  There may be some new numbers on the 509 or some inputs may have new names.

To select an input you use the command SLI** where ** is a two digit number.  This is the list in the excel sheet I uploaded and that you linked to in your last post:

"00" sets VIDEO1    VCR/DVR
"01" sets VIDEO2    CBL/SAT
"02" sets VIDEO3    GAME/TV    GAME
"03" sets VIDEO4    AUX1(AUX)
"04" sets VIDEO5    AUX2
"05" sets VIDEO6
"06" sets VIDEO7
"10" sets DVD
"20" sets TAPE(1)    TV/TAPE
"21" sets TAPE2
"22" sets PHONO
"23" sets CD
"24" sets FM
"25" sets AM
“26” sets TUNER
"27" sets MUSIC SERVER
"28" sets INTERNET RADIO
"29" sets USB/USB(Front)
"2A" sets USB(Rear)
"40" sets Universal PORT
"30" sets MULTI CH
"31" sets XM*1
"32" sets SIRIUS*1

On the tx-nr509 you can get the following inputs to work for you:
NET   SLI28
BD    SLI10  (which used to be called DVD not BD... and by the way you can rename your 'BD' input to something else like 'PC' but it will still be SLI10)

As shown in the list the input for game is SLI02.  If you are trying to find another input that is not listed it should be easy enough to figure it out using trial and error.  

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Hi Guy

here is the Onkyo codes for 2010

Thanks.  After a pretty  quick look, it doesn't seem like much has changed!