EPROM Erasers?

[Tony Duell]

> How long should you erase EPROMs for?  "Until they're done", I suppose,

IIRC most data sheets give times of around 20 minutes.

There was a circuit in one of the maganzines (probably Elektor) a few 
years back for an intellegent EPROM eraser. It kept on reading out all 
the locations of the chip and left the lamp on until all bits read out as 
1'sm then gave <n> times more exposure to be sure. Now whether the rest 
of the chip (address decoerd sense amplifier, etc) was known to work 
correctly when exposed to UV light, so how reliable this test is, is another 
matter

-tony