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Using external INT0 on DSTINI400 in C with Keil

I have bodged an Exar UART onto a DSTINIs400 board & need to use INT0 with it. As a starting point pressing a push button to create an INT to test a handler gets executed would be nice before getting into writing various UART routines.

When I compile my C code, I get the
warning L30: memory space overlap
from c:200003H
to c:200007H

I'm not sure why this has happened & how do I get it working??

I am using the mon390 code to debug.

Help! Thanks

Trevor

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