I won a joblot of 3 PlayStation consoles on eBay in April.
When they arrived, there was a 1002, two 5552s and a 9002. Wait, that's four...
The 9002 wasn't mentioned in the listing.
A few days ago, I was using a boot disc to boot a copied game on the 9002.
Next time I turned on the console, I forgot I left the copied disc in it, and to my surprise, the copy booted up!
Curiously, I took it apart to find out it has a mod chip inside.
Also, whoever installed the mod chip did a very neat soldering job.