How do you mod the PS1 for Digital Audio via TOSLINK?

So then I need to get an earlier PS1?

 

If you have one of those models and you want to mod it for digital audio, then yes.

 

Thanks TriMesh, when I look at the image below i get the idea that the very last 3~ revisions are less "desirable" for modding (unless boardsize matters)

 

The SCPH-5500 and the SCPH-7000 will work with this mod but the SCPH-7501 and later will not.

 

Any of you guys end up doing this? I recently acquired some broken units (1000 and 5500 series). I am thinking about restoring the 5501 and then going the digital audio route with it.

EDIT: Hmm Looks like citris3000psi and darcagn had some success with the 7000 series here: http://assemblergames.com/l/threads/700x-ps1-toslink-success.57639/

 

Heres my guide for a 700x
http://assemblergames.com/l/threads/700x-ps1-toslink-success.57639/