At 10:42 11/11/96 -0500, you wrote:
>I had answered earlier that the test pin is used for programming and I'd
>check the data sheet. I did and the sheet says to tie the pin to ground
>for normal operation.
>
>BAJ
>

The reason I asked my origional question was that I am getting strange
crashes (maybe once or twice every few hours) on a 17c42 project.
I use Timer0 to generate 2.5mS Ints and also am using the serial RX int.
The thing works ok if I am not communicating with it but crashes somtimes
when I do. I run the chip at 16MHz and comms at 9600, with 1mS between
bytes. The reciever int stores the incoming bytes in a buffer. I save
the w,status & pclath regs on entry to an int,with the save code at the
int vector address rather than with the rest of the int code. Initially I
had the test input floating and was desperatly hoping that this was the
cause of my problem. Sadly it was not.

Thanks in any case to all who replied.

Joe