Low level emulation of the CD controller

[simias]

As far as I know nobody has attempted to LLE the PlayStation CD controller. It would be quite performance intensive and an HLE implementation is probably good enough 99.9% of the time but if somebody wants to give it a try it could be interesting for accuracy's sake.

No$ managed to dump some of the ROMs of the 8bit controller: http://www.psxdev.net/forum/viewtopic.php?f=70&t=557

He also has many details about how this controller works in his spec. That could be a starting point.