HelenOS sources

PS2_MOUSE_SET_SAMPLE_RATE  400 uspace/drv/hid/ps2mouse/ps2mouse.c 	MOUSE_WRITE_BYTE(mouse, PS2_MOUSE_SET_SAMPLE_RATE);
PS2_MOUSE_SET_SAMPLE_RATE  405 uspace/drv/hid/ps2mouse/ps2mouse.c 	MOUSE_WRITE_BYTE(mouse, PS2_MOUSE_SET_SAMPLE_RATE);
PS2_MOUSE_SET_SAMPLE_RATE  410 uspace/drv/hid/ps2mouse/ps2mouse.c 	MOUSE_WRITE_BYTE(mouse, PS2_MOUSE_SET_SAMPLE_RATE);
HelenOS homepage, sources at GitHub