.You can use FA-124 to develop programs using the same commands as those available on the fx-9860G SD/fx-9860G. You can store your programs on your computer, and use the FA-124’s data communication functions to transfer them to your fx-9860G SD/fx-9860G when you need them. Go to Tools, then Model type and click fx-9860 and make sure there is a check there. You should see windows within FA-124: fx-9860 and Computer. Plug in your cable to your computer and the fx-9860. Before you plug in, make sure your calculator is set to USB mode. Turn on your calculator, and select LINK.