On Tue, 6 Jan 1998 19:24:03 +0100 Rickard Gunie <e96rg@EFD.LTH.SE>
writes:
  The project i'm working on is a PONG game
>using only a PIC16F84, 5 Resistors and a Chrystal, so I need the speed
>to get better x-resolution on the screen.

If you don't need the data EEPROM, use one of the 18-pin EPROM PICs like
a 16C61, 16C55X, etc.  They have everything the X84 does except data
EEPROM.  Most are rated to about 20 MHz.  Sounds like an interesting
project.
>
>> If I remember correctly, the oscillator in the chip is one of the
>> first
>> things to fail at high speeds.  So, use an external oscillator.

Since the fastest F84 is only 10 Mhz, and most of the other PICs are at
least 20, I suspect the limitation is the code EEPROM.

  I think you want keep the temperature low
>> and
>> the supply voltage high (ie. if the part is normally rated at 4 to 6
>> volts, it is more likely to work at 6 volts than at 4 volts.)

This sounds right.  The F84 in HS mode is rated from 4.5 to 5.5V, at
slower speeds it can go down to 3V.