On 7 Apr 2012, at 18:02, Tom Easterday <tom-...@bgp.nu> wrote:

> Yes, they are compatible.  We run a a 320x with the Mesa 7i43TA card.

I think that is the answer to a slightly different question. 
The 5i23 in the G540 configuration emulates the parallel port pinout that suits 
a G540. What this means is that the stepgen pins are in the right place, for a 
G650 and can't be moved. (general purpose IO can be re-mapped in HAL.)

Check the Gecko docs to see if that pinout suits you. I would suspect not. 

Bear in mind that the 5i25 has a second header, with another 25 pins, which can 
be any gpio or hostmot2 function. 

What pinout do you want?

As well as parport emulation, the 5i25 can connect to a variety of semi-smart 
cards, for a lot more IO and/or things like analogue spindle control for a VFD. 
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