I've got another teaser....
The system has 48 identical PIC (18F4585s) circuits.
I noticed "something" I could not understand.
On a suspicion, I added code to trap stack over/underflows.
Sure enough!  On a MCLR reset to all the chips, a few hit the underflow 
trap.
They all have identical code.
They use the internal 8 MHz oscillator with 4:1 PLL.
The boot code has no subroutine calls.
The running code does use subroutines, and interupt calls.

Any thoughts?
Tom

-- 
  *
  |  __O    Thomas C. Sefranek   WA1RHP@ARRL.net
  |_-\<,_   Amateur Radio Operator: WA1RHP  
  (*)/ (*)  Bicycle mobile on 145.41, 448.625 MHz

http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org


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