At 17.20 17-03-1997 -0800, you wrote:
>Hi all,
>
>I'm trying to program a 16C84 with a low cost PARALLAX programmer
>and have some trouble:
> [ ... ]
> Problem is as the chip is programmed for Crystal oscillator
>the programmer as many difficulties to read and program it.
>
>Does anybody know if it's necessary the oscillator section run properly
>to re-program a 16C84 ?
>Does somebody have the same problem with a parallax programmer ?
>
>Regards,
>        Philippe.

Hi Philippe

I've had a similar problem with a 16C74 and a Smart-ICEPIC, a
programmer/simulator/emulator from RAM Technology Systems, Dorset, England.
 The PIC was not programmed reliably when the oscillator was running.  I was
told that it's a problem with PIC device, not the programmer.
Try disconnecting the crystal while programming, the device don't need it.
It worked for me and the 16C74. I don't know about the 16C84 but it may work
for you too.  Bonne chance.

Regards
Michael