I'd go with Steve's suggestion.  The dual core 330 Intel boards are 
pretty much impossible to beat for performance/$.  At the moment I have 
three of them.
You can buy DC to DC power supplies that will maintain regulation 
through an engine cranking cycle - Minibox sells them also.    And the 
cost is reasonable.  Laptops are a crapshoot at best.

The Minibox M350 boxes are nice and cheap.  I'd consider step and 
direction output to a servo drive if all you want to do is steer.  Link 
in a GPS via a Python program. I think you might be able grab some GPS 
interface code from one of the Marine Chart Plotter open source 
programs.   The oftentimes use an NMEA? interface protocol. 

I think you probably need to worry more about how to power the servo 
drive than how to power the PC.

Sounds like fun.

Dave

Stephen Wille Padnos wrote:
> Jon Elson wrote:
>
>   
>> Jack wrote:
>>  
>>
>>     
>>> For a sim only version, I even saw on phlatforum.com a guy posted 
>>> instructions
>>> on running the emc2 CD on VMWare on a windows machine.  It whines about
>>> not doing the RT correctly, but it works OK for simulation.
>>>
>>> If we could find an inexpensive small board that is bullet proof enough for
>>> shop use, that could be a real boon to the spread of EMC2 and low cost
>>> CNC work.
>>>  
>>>    
>>>
>>>       
>> I am hoping the Beagle board will be that, and am working toward that 
>> end.  The only
>> real roadblock is RTAI, and the ARM maintainer for RTAI is working on it.
>>  
>>
>>     
> Considering that a D945GCLF2 motherboard is $80, 2GB memory is $40, a 
> hard drive is $50, and a DC-DC power supply is $50 (you could of course 
> get a full ATX case with power supply for less), I'm not sure where the 
> beagleboard really helps.  It's definitely smaller.  It's somewhat less 
> expensive (though I'm not sure how far below $220 you're going to get, 
> once you add a power supply, I/O conditioning, etc), it takes somewhat 
> less power (3W vs. 26W).
>
> For the small differences in cost, size, and power, you end up with a 
> full PC with gigabit network, 1.6GHz dual-core CPU, reasonable 3D 
> graphics, excellent latency numbers (maybe 8000 or so IIRC), and a PCI slot.
>
> Of course there's always a bit of pride to be taken in doing more with 
> less, I'm not sure there's really a great payoff here.
>
> - Steve
>
>
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