What is the difference between the Flight Control Systems of different F16 models? it is mentioned that the F16 A/B variants had an analog FCS, while the C/D version introduced a digital FCS starting from block 40.

Can somebody elaborate on the differences between them and point me to some reference?
The  main difference  is  processing speed, with the digital FCC's being faster than the analog models ( the analog-equiped aircraft it takes their FCC longer to detect the over-G, determine a correction, and send the correction to the actuators)and that's why first blocks until the 40 blocks will show +9G in the HUD .