What is the flag in 8085 can't access directly?

In the 8085 microprocessor, the flag that cannot be accessed directly by the programmer is the "Auxiliary Carry Flag" (AC). This flag is primarily used for binary-coded decimal (BCD) arithmetic operations and is not directly accessible through the instruction set. While other flags like the Sign, Zero, Parity, Carry, and Auxiliary Carry can influence program control, the Auxiliary Carry is typically manipulated indirectly through specific arithmetic instructions.