There are errata sheets for revisions B, B3 and B4

But how do I tell which revision my chip is??
(without testing...)

Maybe can we use the date code some way?

I have one marked

PIC16F877-04/P
9924018

And one

PIC16F877-20/P
9921BSL

Thanks in advance

PS  Recieved the ICD today.  Look very nice :)  DS

/Morgan
Morgans Reglerteknik, HŠllekŒs, 277 35 KIVIK
  tel 0414-446620, fax 70331, mrt@iname.com