From some links I remembered this Rabbit and I got this :

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Stack Segment - the stack size is usually 4k, extending from LA 0xD000 to 0xDFFF. It is always mapped to RAM. The stack starts at the highest address and grows downwards
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When talking about porting code, I am not sure how these things are handled. Maybe there are ways - so far I never had a requirement - maybe many of you must have done it.

Raghu