piclist-bounces@mit.edu wrote:
> ICD0154: Invalid target mode for requested operation (TM = Running)
> 
> What foolish mistake(s) am I making?
> 

There is a problem with running at 20MHz on the '877. Switching to
MPLAB 6.61 fixed it for me. IIRC, this problem did not exist on
the '877A and MPLAB 6.60

Search the piclist archives, this was not very long ago.
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