At 10:18 AM 11/1/97 +0200, you wrote:
>Well well. My 16C84 died. RIP.
>
>The duco on it says PIC16C84-04/P    9543CBW
>
>>From the last number I gather it to be manufactured in 1995 4Q 3rd week?

I believe it means year 95, week 43.  Unless Microchip is different from
other manufacturers when labelling date codes.

Rob