At any rate you should evalutate carefully the need for complex data types in C on an 8oops51 type processor. The underlying code can get pretty ugly, and gets especially so if the indexing distance from the base address of the structure(s) gets farther than 256 addresses away. I have foound that some times an unrolled set of data elements may lead to a considerable increase in access speed at the expense for compactness of C code.

Michael Karas