I Pushes the input base on the top of the stack. Pops the top of the stack, and uses that value as a nonnegative scale factor. The appropriate number of places is displayed on output and is maintained during multiplication, division, and exponentiation. The interaction of scale factor, input base, and output base is reasonable if all are changed together. The register x is not changed.
All registers start with zero value.
Lx Treats x as a stack and pops its top value onto the main stack. Pops the top value on the stack and uses that value as the number radix for further output. O Pushes the output base on the top of the stack. The top value remains unchanged. If dc is executing a string, it pops the recursion level by two.