I'm not there yet.
That page on the raspberry pi looks very thorough. Impressive.
So I've reversed the Y and Z axis motor connectors, should be good on the directions now, and switched the extruder heat and sensor leads so #1 is closest to the limit switch on the left. I also reversed the motor lead for extruder #2.
The good news? After no luck connecting with the printer at all I tried a more robust USB cable from an old camera and that is working much better. Connectivity for now at least seems to be solid. (In all fairness I did damage the small connector end of the USB cable that came with the printer, so my fault guys.) Have to use an external mouse because the touchpad goes all wonky with the printer connected but otherwise it seems to be working well. Home is correct in all three axis now, and I set "Park" to 110, 200, 100 (x,y,z) and that works well. I tried 110, 200, 200 but it would not take it, I'm guessing some sort of internal limit maybe? Handy feature btw for unloading.
The extruders are working and run in the right direction once up to temperature (or nearly so, again, an internal limit I suppose), and bed temp looks right.
So next would be to align the machine and get it ready for a first print.
But I've been thinking a bit more about a dedicated computer to run this thing.
I wonder if my old IBM Thinkpad 600 will run this OK? It has been my dedicated MegaSquirt tuning laptop up to now and has a pretty stripped down install of Windows XP and 196M of ram with a 265 Mhz Pentium-II processor. It has a dual USB PCMCIA card and I just ordered a wireless PCMCIA card for it. No memory card slots though...
Or, there is the Toshiba Satellite which is a little hotter laptop but somehow managed to fry it's display driver (backlighting I suspect because it works during boot and has a shadow display in Windows) and has to use an external monitor...
Or there is the Sony Vaio PC that is earmarked to run the servo drive system (Galil) on the milling machine but is sort of on hold. I could "borrow" that for awhile. Don't recall the specs but it's a fairly decent machine I think.
What would you guys try?