actually. I don't know what the hacking and emulating crowd uses the term "PSX"
The PSX was an expensive DVR / PS2 console that was sold in japan only...
wikipedia -
Released solely in Japan in 2003, the Sony PSX was a fully integrated DVR and PlayStation 2 video game console. It was the first Sony product to utilize the XrossMediaBar (XMB)[56] and can be linked with a PlayStation Portable to transfer videos and music via USB.[57] It also features software for video, photo and audio editing.[56] PSX supports online game compatibility using an internal broadband adapter. Games that utilize the PS2 HDD (for example, Final Fantasy XI) are supported as well.[58] It was the first product released by Sony under the PlayStation brand that did not include a controller with the device itself. It was priced around 79,800 yen...so in USD that's almost $1,000!...holy shit!!
Source -
http://en.wikipedia.org/wiki/PSX_%28DVR%29