Hello,

Using B757 base pack on FSX:

Basic ADI with Fast and slow indications, it works reversal, it means, when you fly 10KIAS slower than the selected SPD on MCP or FMC, it shows the magenta square on the top of the indication (F) and it should indicate in the bottom of the indication (S). See attached image, see SPD command bug, it commands 290, actual SPD is 273, and the indications show Fast, and should indicate I'm slower (S). Manual says:

11. Fast/Slow Indicator
Displays airspeed information.
- indicates deviation from the airspeed selected by the FMC or the IAS/MACH selector, or limit speed
- small diamonds indicate 10 knots fast (F), or slow (S).