Yamaha psm-275 for Prottols and reason

[tz720]

Windows XP
RAM: 1.5 gb
Driver type: DirectX
Audio card: fire wire

MIDI interface: yamaha psr-275

Problem:
i was wondering where or how i could find a yamaha psr-275 driver or which one in protools m-powered would be compatible. i ve currently set my midi to psr-225 and it freezes on one piano key stroke.. then fades ...
I m really looking for a psr-275 option
for reason and protools

any thoughs ?
thanks!