The difference between the two boards is design software.
The old timer is designed for only in circuit programming of the hex after compiling the C source code with the advance map imbedded into it.
The new timer gets the basic hex file programmed into it first with a pic programmer board. Then there is the bootloader program which will contain the settings made with the control software program with the easy start, timing advance table, and delays for the timing settings. This software also runs the on screen rpm monitor, visible degrees of advance and a graph showing both. Monitor mode selected by pulling off the jumper and switching the program to watch your results with the timer and cdi running your engine.

The old timer does none of this and is not compatible with the control software for the new timer board.

The French designed CV-2 is also a design with it's own control programming software. Not compatible with other timer board pic chips. I have also built that one and it works fine. You may be getting confused between all of the available timers and cdi boards.

I hope this clears up some of the misunderstanding I have seen taking place.


John