Thank you all for your help.
This issue seems to be solved with success.

The problem was the cable between programmer and PIC. It was just to long
(using the old ICD2 cable with 30 cm and adapter cable of 15 cm). We changed
now to the newer 15 cm ICD2 cable and short the adapter cable of 4 cm.

Best Jens

> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of jmg
> Sent: Wednesday, November 12, 2008 9:07 AM
> To: 'Microcontroller discussion list - Public.'
> Subject: RE: [PIC] Reading a Port issue with 16F877A
> 
> Hello,
> 
> > You say the new boards use a 16F877A chip - do the old boards use a 
> > 16F877 ?
> > There are some subtle differences between the two chips. 
> 
> I know, and all are 877A.
> 
> Best Jens
> 
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