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.

Josh
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A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
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"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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