Bruce, I have not been able to try programming on the programmer since they are SMD chips.

But have tried to program the PCB on a friend's Microchip ICSP programmer and it did it OK. Others do not. I don't know what more does the Microchip system do but will investigate to it.

Soon will have some DIP to try also.

The strange thing is that with exactly the same hardware config F628 works OK but F819 does not.

Ioannis