I haven't looked at an 8085 spec in a long time. If I recall correctly, only if the 8085 has an internal crystal can you get away with an external RC circuit to generate a usable 32.768 khz clock.
As for providing a higher speed clock, it depends on how clean and stable you can make the clock edges. And RC circuits by themselves aren't so clean.
Edited by galahad05 - 2/22/12 at 10:32pm