You can download the TI-30Xa guidebook from the manufacturer's web site at
http://education.ti.com/calculators/downloads/US/Guidebooks/Detail?id=6132
The TI-30Xa replaced the TI-30X within a year. The only enhancement was the added Constant key.
The TI-30XII, introduced about five years later, is a significantly different calculator, incorporating, among other things, a two-line display.
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