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You can find the manual on All Book EZ by searching the title. It is a site to find eBooks and manuals.
One can find an Omni 3200 reference manual on the manufacturers site as well as in the instruction maunal information that came with the device itself.
Keypad of what? You should find the user manual of whatever it is you are using.
On a car, the easiest and most practical way is to find it in the owner's manual.
If it is in the 83 series, try commands 3 and 4 on the CALC menu. Check your manual (or the online pdf manual) for more usage information.