>From what I can see in the data sheets, I am assuming the only real
difference between the 6x and 7x chips is the A to D?  I have a design
to use two 16c64's and it would be really nice go ahead and have the A
to D available for later prototyping.  Anyone used the 74 to develop
code for the 64 OTP's?  I assume the only code change would be not
having to disable the A to D converters?