Dance Dance Revolution 4th Mix (c) 2000 Konami.

>>> TECHNICAL DETAILS
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Main CPU : PSX
Sound Chips : SPU, CD/DA
Palette colors : 65536
Players : 2
Buttons : 6
- SCORING -
Grades : AA - A - B - C - D
Let n be the number of the step in the combo. Then, the point value for the nth step is :
S(n) = G(n) if the step is a Great step, and P(n) is the step is a Perfect step;
G(n) = 555 + 333n;
P(n) = 777 + 333n;
Therefore, the total point value for a combo of n steps is the summation of S(n) from 1 to n.

>>> GAME SERIES
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1. Dance Dance Revolution (1998)
2. Dance Dance Revolution 2nd Mix (1999)
3. Dance Dance Revolution 2nd Mix with beatmaniaIIDX CLUB VERSiON (1999)
4. Dance Dance Revolution 2nd Mix with beatmaniaIIDX substream CLUB VERSiON 2 (1999)
5. DDR Best of Cool Dancers (1999)
6. Dance Dance Revolution 3rd Mix (1999)
7. Dance Dance Revolution USA (2000)
8. Dance Dance Revolution 3rd Mix Plus (2000)
9. Dance Dance Revolution 4th Mix (2000)
10. Dance Dance Revolution 4th Mix Plus (2000)
11. Dance Dance Revolution 5th Mix (2001)
12. DDR MAX - Dance Dance Revolution 6th Mix (2001)
13. DDR MAX 2 - Dance Dance Revolution 7th Mix (2002)
14. Dance Dance Revolution Extreme (2002)
15. Dance Dance Revolution Extreme 2 (2005, Sony PlayStation 2)
16. Dance Dance Revolution with Mario (2005, Nintendo GameCube)
17. Dance Dance Revolution SuperNOVA (2006)
18. Dance Dance Revolution SuperNOVA 2 (2007)
19. Dance Dance Revolution X (2009)

>>> GAME PORTS TO OTHER SYSTEMS
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* Consoles :
Sony PlayStation (2001)

>>> OTHER GAME RESOURCES
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Game's rom.
Machine's picture.