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im using the Keil compiler to build a communication gateway between 2 bus standards: Profibus and Modbus. The uC software consists of a Profibus slave integrated with a Modbus master. I tested the Modbus master software on an 89c668 evaluation board using off chip xram. the board i have designed for the final project uses the on chip 8k ram of the 89c668. though the software works perfectly on the former board, it refuses to run on the later. the variable mapping has been changed to use on chip ram. however the variables dont seem to be placed in the correct locations (keil shows them to be correctly mapped, but they r not accessed after programming the uC). any help would be appreciated.