EPROMS

[Scott Schaaf]

bruce plecan wrote:
> 
> I've been using 2732As, and now find out they are "supposed" to be 27c32s?.
> Now on the 27128, 27256, 27c128, 27c256, what do I do?.  Is there a
> difference
> in the 27128 to 27c128,  and my lil book shows a difference in programming
> pins, and voltages from 27128 to 27256's.  Is there a "safe" way to try and
> read
> one first?.
>   Thankx again  Bruce      nacelp at bright.net    Cone shaped hat gettin too
> 
> comfortable to want to take
> 
> off

It is safe to READ a '128 as a '256,  USUALLY what you will get is one
of three bin map files.

	1.  Lower half of '256 memory map blank, (FF)
		means chip is a '128, A14 tied Low

	2.  Upper half of '256 memory map blank, (FF)
		means same as above, just A14 tied High

	3.  Lower and Upper half of memory map identical.
		means A14 is floating.

Now BURNING them is a different story.

				Scott...