I wouldn't use a saw of any type because of the dust. If you are cutting older boards you are dealing with PCBs that are far more toxic than even the combinations of acids I use to refine precious metals. It's nasty nasty stuff.
What are PCBs?
Even wearing a respirator and having the particulates sucked away you are still dealing with minute particles.
There are many other reasons not to use a saw. Anytime you are breaking down electronics (scrapping) it's always better not to use a saw than to use one. Grinders, saws, wire wheels, etc are all not advisable. The most valuable electronics to scrap are those before 1979 which also will probably be made of PCBs.
Scott
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