This post is to try to clarify what is meant by the different versions of VEX and why V5 is called V5. Back at the Worlds 2017 new product non-reveal by Paul Copioli, I believe I remember him explaining it was called V5 because it was the 5th control system released by VEX. Those control systems, as far as I can tell (please correct me if I am wrong), are:
PIC Microcontroller https://www.vexrobotics.com/276-2170.html
VEX ARM Cortex https://www.vexrobotics.com/276-2194.html
VEXpro ARM9 https://www.vexrobotics.com/217-2180.html
VEX IQ Robot Brain https://www.vexrobotics.com/robot-brain.html
V5 Robot Brain https://www.vexrobotics.com/276-4810.html
I understand there was an even earlier one, but that one was before VEX was a brand name: VEX EDR cortex age
So to be accurate, the Cortex based system is not V4 vs the new V5, Version 4 of the VEX control systems would be the VEX IQ Robot Brain.
This of course doesn’t even go into the different versions of these products or the different communication and controller systems over the years. If any old-timers or historians have some more interesting bits, or corrections to my list, I would find it interesting.
I had thought a list similar to this had been posted in the past, but I couldn’t find it in my searching.