> 
> It erases a chip in 15 seconds. But only ONE chip at the time. 
> 
  I only have the 16c56jw parts to go by, but my eraser cleans them up in 30 secs or so..  Is my eraser just a good one or are some of the other eprom parts just that much harder to erase?  Everybody talks of 10+ minutes which is what I'm used to from large eproms on other erasers but I haven't done much besides the 56 for comparison.