Dual-mode microprocessor inside pneumatic FramePro Model 600E/700E/750E guards against unintentional nail drives without hindering productivity. When trigger and safety are pressed successively, gun drives one nail per bounce as long as time between drives remains 1 min or less. When safety alone is depressed, tool drives one nail per trigger pull, so long as time between nails remains 2 min or less. In either mode, timing out requires that tool be reset. Sophisticated controls prevent accidental discharge, protecting workers and property. Screw gun version is also available.