S/P-DIF Interface (internally) on CD players?

S/P-DIF is the Sony/Phillips-Digital Interchange Format.
The upscale models of the Sony CD changers that include the optical output have an S/P-DIF output internally to generate the optical output.

Most PC CDROM drives also have this interface but generally don't use it. The SPDIF interface is a 2 pin TTL digital output. I have recently come across a very easy way to add the optical output circuit to this 2 pin connection.

Has anyone opened up one of their Sony CDPCX200/205 or similar units? Do you know if internally there is any SPDIF connection? Since these players only output analog, somewhere before the DAC, there must be a place to attach to the SPDIF signal. If so, adding an optical output to these players would be simple and cheap.

I just wanted to know if anyone has opened one of these players or has knowledge of the SPDIF interface - before I go tear into my player.