The electronic Help Book ("eBook") "C51.pdf" describes 8051 language extensions and 8051 derivatives. That's fine. I miss a helpful additional eBook in the Book Window of µVision V2.40, which describes the Standard-C Language (or ANSI-C Language). Perhaps likely the printed book "Kerninghan&Ritchie The C Programming Language" or so. I often use this printed book (i.e. Table with Operators, Table for printf arguments, ...). So I hope to get an advice to get/to buy this eBook? Thanks a lot Martin