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AT89S8252 with internal ROM and RAM

Hi.
I'm trying to get started in 8051 programming with this Atmel chip and Keil uVision2 (Eval version)
I'm new in programming microcontrollers. I'd like to make it simple and use internal FLASH and RAM, but I don't know how. When I set "Use internal ROM" in Target configuration, I get the "L120" error message. Reading the .M51 file of my proyect, I notice that the compiler is realy using low CODE addresses that should fit in the 8K flash, but it don't finish the compilation.

Can you help me?

thank you very much.

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