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C51 : Old program and some question

Hello
I am working in a medical company
they give me a program for At89C55wd when i want to debug the project,its message is :

error 56 : cant open file
what is you opinion about this?

and i have
#define lowPrsPressure *(XCHAR+0x81A2)

in program and XCHAR is undefined identifier
i think XCHAR is similar to XBYTE.
Can anybody help me?
Thanks

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  • Dear Andrew
    Thanks for your reply
    because they don't know about their program!
    they have hex file and program their MCS
    I want to change some option but I can't debug the program.
    in the main program (it's name is CONTROL) we have header file address.h with XCHAR definer
    maybe in keil 2 this definition is correct.

    know the company want to change the program and MCS to ARM but we should answer old customers requirement.