Using the Equation Solver for Integration on a Casio fx-CG50 | Calculus on CG50 - YouTube
RARE NOS Casio Straight Flush Vintage LCD LED Digital Game Watch! GC-50 GW-10 | WatchCharts
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User manual Casio FX-CG50 (English - 678 pages)
Update: It really does go without saying, the FX-CG50 is a beast of a calculator. But my trusty FX-991EX is still good for a lot of things. They are both good calculators. :