"But, I imagine that the experts here have dealt with this kind of 8051 interfacing problem and might suggest a workaround."


I program the 8051 over more than 10 years, but I faced never such problems on all my applications.

Since whenever a serial communication was needed, I select typical standard crystals like 11.0592MHz, 14.7456MHz and similiar.


If you can not do the needed small changes on the 8051 source code, I see no easy solution.
On any PC only baudrates of 115200/x can be selected.


Peter