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  Name:     peekstr() - read string from specified memory location
  Usage:    <string> = peekstr(<seg>,<off>,[<length>])
  Params:   integer <seg> - the segment address to read from
            integer <off> - the offset address to read from
            The two address parameters can also be specified as
            hexadecimal strings for convenience since memory
            locations are usually specified in hex notation. If
            you specify memory locations in hexadecimal, you must
            specify both parameters as hex strings, or both parameters
            as integers, but not a mixture of both.
            integer <length> - the number of bytes to read into
            the return string. Optional, if left off, then the
            string is filled until the first null byte is encountered.
            This is useful for DOS interrupts that return
            segment:offset addresses of null terminated asciiz
            strings

  Returns:  a string equal to the bytes read from the location
            specified by the memory address passed.

 ---------------------------------- Example ---------------------------------

            * This example reads the rom date at address F000h:FFF5h

                 ? peekstr("F000h","FFF5h",8)