Remember the good old Super Mario Bros - the jumping plumber, or Super Contra - the fighting machine or the world of Aladdin. Most of us grew up playing these games. But like any other era, that era also passed, leaving us in a world of tension filled graphically intensive games, which are too hard to play, let alone master. Sometime we long for those simple days when all we had to do was to leisurely press some buttons.
Those simple, fun-filled days can come back again with emulators like Nestopia. You can download Nestopia from here or you can just do a Google search for the same. You can play any of your all time favorite classic games by just opening the desired game ROM with Nestopia. Numerous nes ROMs are, freely available at freeroms or from other sites such as romhustler, emulatorworld as .nes or archived files. For example download Super Mario Bros from here. Just extract Nestopia137bin downloaded above, run nestopia.exe and through File>Open open the nes ROM of the game you want to play (just like you open a file with any other program) and there you go!
For control, you have the option of using any input device either the keyboard or a gamepad - just like old days. You can configure the Input device from Option>Input, then selecting Pad1 and assigning keys from your input device (shown in "Mapping") to the action expected (shown in "Key").
Who says the simple good old days are gone forever?