MetaCard External SDK pre-Carbon?

[Trevor DeVore]

Does anybody know of a resource for pre-Carbon externals in MetaCard?  
Is there an SDK hiding somewhere?  After doing some testing It seems 
that memory allocation must be handled differently in a Classic 
external as opposed to a Win/Mac OS X external and it would be good to 
see the proper way to approach this.

Thanks,

Trevor DeVore
Blue Mango Multimedia
trevor at mangomultimedia.com