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Simulation not running

I have been trying to write a code using keil IDE to display characters on an LCD (LM016L) and a AT89S52 MC. but whenever I run the simulation in Proteus. only the background for the LCD is turned on. but the characters are not displayed. could it be that I lack libraries for the LCD. if so, may you assist me with a link to a site I can download necessary libraries for a simulation. otherwise please advise appropriately, thanks in anticipation.