Next EPROM Question - Sizes

Chuck Guzis cclist at
Sun Sep 16 21:55:12 CDT 2007

On 16 Sep 2007 at 19:34, Zane H. Healy wrote:

> So the question of the minute is this, is it possible to substitute a 
> 27C256 for a smaller 27C128?

For reading, sure.  The difference is pin 27--PGM/ (program enable/) 
in the 128 and A14 in the 256.  So program your data into the upper 
half of the 256 (or just program two copies of it--then it doesn't 
matter if pin 27 is high or low).


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