- Pop'n stage & Pop'n stage ex are dj-main hardware.

- Dance Freaks/Dancemaniax series are System573(Digital) hardware.

- Pop'n Music 4�`8 are Original BEMANI Hardware(I don't know about specs.but also PSX based)
pictures are available in below URL(japanese auction)
http://page4.auctions.yahoo.co.jp/jp/auction/d36711993

- Keyboardmania series aren't BM3 Hardware.It same as Pop'n4�`8 Hardware.
(but some components are not same.This hardware could change hardware components)

- Pop'n Music 9�`10 are NEW Hardware.not same as Pop'n4�`8.