A
740 version
s_left 	s_right t_bottom t_top
0   	10  	0	125	// comment: autopilot display: speed 1000
10   	18  	0	125	// comment: autopilot display: speed 100
18   	26	0	125	// comment: autopilot display: speed 10
26 	37 	0	125	// comment: autopilot display: speed 1
behavior*:
- Blank until you push the SPD_SEL knob.
- Blank when FMC-VNAV controls command speed. 
- Displays current speed when first powered.
- Displays 100-200 knots when first powered on the ground, depending of airplane type.
- The IAS/MACH window is not blank if SPD or FLCH or V/S is active. 

* the SPD_SEL knob should have 3 hot spots: left, central, right
left: decrease speed
center (simulates pushing action): Pushing alternately changes:
			--> current speed (for HM displays 200 knots if pushed on the ground. different speed in according with airplane type) 
			--> FMC speed
			--> blank.
right: increase speed
