ok.. that makes sense. Thanks for this information. I am now thinking this is the reason why I was having a heck of a time trying to install the Wacom drivers. The Wacom drivers installed fine, but the Optional Input Devices software fromt he Std Execution Environment would not install from the 6.5.28 overlays as if kept resulting in conflicts that did not make sense. i.e. "Cannot be installed because this version is older than the current version" - even though I was installing a much newer version. I was able to install the 6.5.28 overlays onto the existing 6.5.12 system before I posted this thread. Appart from some conflicts it appeared to work, but now I wondering how much actually installed. Since this was a fresh IRIX install, I think I will wipe the disk and reinstall properly. Thanks

2x600mhz R14000 Octane2 dual head V12 / V10, 7 gig Ram

2x250mhz R10000 2gig ram, MXE, Digital Video, MSCSI, Jaleo

400mhz R12000 O2, 1gig Ram AV1 - 250gig Media' raid

180mhz R5000 Indy XZ 256mb ram

200mhz R4400 Extreme…….Under Construction
Dell T7600 dual 3.5 Xeon, 512 gb ram, Quadro K6000 + Tesla k20 - DaVinci Resolve Studio Editing
Dell T5500 dual 3.2 Xeon, 72gb ram, Quadro 6000 + Tesla C2075 - DaVinci Resolve Studio Cutting
Intel i7-990x 3.46GHz Extreme 6 core / Quadro 5000 & 2 x Tesla C2075 / 24gig Ram inside an SGI 320vw case