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Subject: What is the difference between chip number prefix and suffix letters?

Date: 08/11/03 at 8:02 AM
Posted by: Stephen J. Krajewski Jr.
Message Posted:

I have a number of now obsolete chips I still use in my CPU cards for a security alarm processor. One chip, the Intel P8255A-5, programmable peripheral interface, also has in its family the P8255AP-5, D8255A, and others. Trouble is that one will work where as the other will not for a given set of alarm points it processes, as verified by chip substitution. What is the difference between a "P" and a "D" prefix; an "A-5" and an "AP-5" suffix. I have the same problem with the Intel P8254, the P8254-2 etc. programmable interval timer. One works better than another depending on the alarm it processes. Can anyone shed some light on this problem?
Intel will no longer support these chip questions in their tech support, as the chips became obsolete in the 1990's. Does anyone know the differences?
Thanks in advance,

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