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Serial Port 1 on the DS89C4X0

Hello!! I'm trying to configure the serial port 1 in a DS89C450 8051-based ucontroller. I want to use it with its associated irq. I configure all, and simulate it. When I force an RI_1 or TI_1 flag, the program jumps to the IRQ, but when finish, the program goes out of memory and doesn't work. I'm not sure, but I thikn I must configure that in the 0x003B memory position there's an interrupt. How can I do this? Thanks very much.

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