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using old code rom with new code ram

Hi,

I have a working old code in rom 32k, I added ram code at the upper 32k and I set the hw to start form the new ram at 32k.

I want to address old function from the new ram code without modify the old project.

once I compile the project code the hex output is not the old rom hex with the new ram code.

rather it recompiled the old code to optize it and I have a new hex that is not like the old rom hex with the new additions.

The thinng is that I need to address the old code function (fixed hex in rom).

what can I do?

regards,
dan