hello
I didn't answer to Richard, I must rere read the timer and interrupt story and make a test first ...
for the CD4059 it's an idea !
I have already said "the well know solution is to use 4 IC like 74LS390 .. too big for me ...i term of placement
there is also an other way, using FPGA item ... I have a good contact to test this solution (not easy to understand)
thanks
Francois