I need your advices, guys.

   I have few working 16F874-based boards.
   I decided to replace 16F874 by cheaper 16F871
 as code is about 1K locations.
 Ordered and received a couple of PIC16F871-I/P
 $3.6 each from local Microchip folks.
   Placed them on the boards, programmed with the
 same code and the same configuration word, verified.

   Now all is working fine, but-t-t start - up time got
 unacceptable: first 16F871 - 4.4 s, second - 6.3 s.
  The same code working with I/O ports and RS-232
 through ICL-232, the same config word "3FFE",
 the same boards and  crystals, only PICs are changed
 and all these resulted in different damned start - up
 times 4 - 6 seconds. (The time between Power-Up
 moment and when PIC starts to send repeatedly
 bytes (250 bytes per second) to PC. I monitor it with
 a scope.)

   With 16F874 on board start - up time is almost
 imperceptible.
   I tried different crystals and resistors with them:
 the picture is the same.

 What am I missing?
 Maybe something simple & obvious?
 I need your advices, guys.

 Thank you.
  Mike.

PS: Locations:
h2007 - config word (h3FFE)
h2006 - device ID value (h0D21)
h2005 - (h3F15) - what is it? Does anybody know?
h2004 - (0000)
h2000-h2003 - (h3FFF)

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