15 is an emulator for the Sega Megadrive/Genesis.
16 It executes the romfile given as an argument.
17 The \fBz\fR, \fBx\fR, \fBc\fR, return and shift keys correspond to A, B, C, Start and Select, respectively.
21 Pause the emulator. If already paused it will step one video frame.
24 Toggle the emulator's speedometer. It shows in the upper left,
25 off-viewport corner, the ratio between the expected and observed time it
26 took to draw 60 frames.
29 Toggle tracing of the emulator.
32 It uncaps the 60fps frame rate and lets emulation go as fast as possible.
46 Scale the screen to a given factor regardless of the window's size.
53 first appeared in 9front (November, 2014).