How do I monitor ram on Keil

[labrat31]

I have been having some problems debugging on Keil due to me being unable to monitor data in RAM how I tried to do this is open the memory window and enter X:30. Anyone know how to do this on Keil?
Im programming a AT89LS51 and want to monitor this RAM

serTx DATA 30H
serRx DATA 31H

byte1 DATA 32h
byte2 DATA 33h
byte3 DATA 34h
byte4 DATA 35h


ORG 00h

Thank you