Hello Mr. Carrol Robinson,
Putting together something that can handle the two
different baud rates should not be to hard. Maybe
something shown in this web site can work.
http://members.aol.com/cpu8052/dualbaud.bin
Set up the Maxim MAX3101E up at maximum baud rate and you
avoid buffer over flow. Setting up the two 89C2051's to
93,750 baud and 115,200 baud should be straight forward.
Some simple assembly software and you have your answer.
Good luck.
Regards,
Charles Bannister