- 0–9 .
- Enter a number
- BASE selector
- Convert entry and stack display
- Enter
- Push or duplicate X
- + − × ÷
- Arithmetic
- Backspace
- Edit entry
- Delete
- Drop X
- Esc
- Clear stack
- S C T
- Sin, cos, tan
- ⇧S ⇧C ⇧T
- Inverse trig
- L ^ R
- Log base, power, root
- I P E
- Reciprocal, π, e
- W U _
- Swap, undo, change sign