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Bidirectional I/O on picaxe X2 chips.

hello

I'm planning to build a LED array to display graphics, patterns and things like that. One Idea is to build a robot with a LED "face".

I have some experience with the picaxe chips so I was planning on using one of those for this build. I've got my eye on the Picaxe-28X2 module.

I've been reading about the 28X2 chip having bidirectional I/O pins but I can't tell from the Picaxe manual spec how many inputs or outputs it has, or how many of these are bidirectional. 

basicly what I'm wondering is: how many possible outputs, that I can use for this project, are there on the Picaxe-28X2?

The standard Picaxe-28X seems to have 17 possible outputs making an 8x8 display, which isn't bad.

 

for examples of similar projecs check here:

http://www.instructables.com/id/LED-Dot-Matrix-Display/

http://www.nerdkits.com/videos/ledarray2/

 

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ok, not exactly an answer to my question but thanks for the input...
Unfortunately the picaxe language makes the picaxe chips too slow for any decent matrix display. Even the X2 chips are way to slow.