Assuming that you have a 48MB RAM card already (otherwise the VIEWpowr will not fit in), you are right to go. Stay with OS 8.6 and you will have one responsive, snappy and satisfying PB. Enjoy!

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(60x) 13DT + 3PB + PTPro; (G3) 7DT/MT; (G4) 3T + PB. System 8.1 to OS 10.5.8