It is important for all to know that when programming 27128 EPROMS that
you take a good look at what the "real" part number is. There is a
significant differance between an 27128 and a 27128A. The differance is
basically that a 128 is programmed at 24v and a 128A is programmed at
12.5v. I think currently the only 128A's we have are AMD's. So if using
AMD parts, take a good look at the number to see if it is an "A" or
not. It is too easy to confuse. You can also tell by the fact that AMD
also marks the 128A packages with a "12.5v PGM" at the bottom of the 
package.
			for your info
			Jerry Saunders