Playstation is Pu-18 running picostation.
SCPH-550x/5552 (1997-1998)
Here, the direct RCA and RFU have been removed from the console (still possible to attain RCA with a multi out to RCA cable), and uses the PU-18 motherboard. The DAC has been downgraded, but all models use the updated SGRAM. Some claim these have the highest quality video output, but this is unverified and needs investigation.
These models are compatible with xStation and PSIO.
PSone (SCPH-10x) (2000-2004?)
A cost-reduced and shrunken version of the PS1, colored in white with a rounded design. About as common as the fat PS1. The I/O of this console is even more reduced than the last revisions of the fat, as the PS one does not have an accessible serial port or a reset button. However, significant modding allows re-adding the serial port to the PS one system. Lastly, the PS ones appear to have some of the best reliability compared to earlier models.
PSones are not compatible with either xStation or PSIO.
1 PSone controller, memory card and scart cable
