Quoting Josh Koffman <listsjosh@3MTMP.COM>:

> The 16f877 has a number of features the f84 doesn't. Have you read the
> f877 datasheet? I don't know anything about the circuit or program
> you're using, but it could be you are getting bitten by not turning off
> a feature, such as ADC.

True, you need to set the ADCON register on startup to enable/disable Port A
and E. If you are trying to use Port A and it's not working, try setting ADCON
first.

>
> Josh
> --
> A common mistake that people make when trying to design something
> completely foolproof is to underestimate the ingenuity of complete
> fools.
>         -Douglas Adams
>
> "mr. man" wrote:
> > I bought Myke Predko's "Programming and Customizing
> > PIC Micro Microcontrollers." I'm using the El Cheapo
> > board, software and MPLAB 6.1. I tried the "ledon"
> > experiment and it worked with a 16F84A, then I tried a
> > 16F877, it programmed and verified OK but when I put
> > it in the circuit the LED turned on and stayed on
> > regardless or input. I tried the home built version of
> > el cheapo and got the same results. I saw some posts
> > about Low Voltage Programming mode (LVP) and tried a
> > 10K from RB3 to ground but got the same results.
>
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