Replace 8051 IC with newer model

I am trying to replace the WINBOND W78E516B chip with W78E516D. The specifications are almost identical. Only there are 2 more interrupts. And few more registers.

But the port 0 does not seem to work with new chip.

I had tried to add a new device database with modified reg header file. But it still has the same problem.

It will be great help, if any suggestion. Thank you.
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