James & Ili wrote:
>
> Does this sound right? I have put together a little program that
> counts from 0 to 9999, it sends out 4 bytes via 9600 RS232 each time
> it increments. Most of the routines have been used in other programs
> and worked flawlessly in them. I have moved the sub-routines around
> thinking that maybe it didn't like the order but nothing. It does the
> first digit. I.E. it outputs a 0 then stops with the pin high.
> Running it in the MPLAB simulator it works great. Any suggestions ?
>         Thanks in advance !
> James Holbrook

When this happens to me, it is usually an initialisation problem.

On the simulator, the RAM, etc.., is initialised repeatably from the
start of simulation.

On a real chip, the RAM will usually power up at 0FFh on the OTP chips,
but not always, and on the -JW windowed dev. chips, it tends to come up
a 000h, unless you are in total darkness! This is due to the effect of
light coming through the EPROM window, (even with paper label) and dis-
-charging the RAM cells during power-up.  A little light does not SEEM
to cause misoperation, however.

jim ford