I think that the problem is in the code itself the function ! is a logical
NOT and not bitwise.
If you need to do bitwize then: -


void main (void)

void
main (void)
{
 unsigend char i;
 volatile unsigned char PORTVAL;

        i =~PORTVAL;            //bits now inverted
}

Hope this helps, I am assuming that you're using C


Dennis




At 22:10 5/05/99 -0500, you wrote:
>It's not clear if you mean the PIC doesnt work, or if your code no longer
does.
>Assuming the latter, I think you'll find that you need to invert your bits.
>i.e.
>the logic states are reversed without the max232.
>
>Paul
>
>At 06:02 PM 5/5/99 -0600, you wrote:
>>I am puzzled why when I try to interface the
>>transmit data line from an rs232 interface to
>>a pic through a 10k resistor to RA1 why it
>>ceases to operate.  On a scope, the levels are
>>a nice 5-0.
>>
>>Works fine with a max232.  The only changes
>>I've made are to replace the max232 chip
>>with a 10k, and change my Rxdata define from
>>RA1 to !RA1.
>>
>>I'm sure someone else has ran into this one.
>>
>>Craig
>
>Paul Davis
>Sr. Systems Engineer
>OEM, Carrier Sales, Healthcare
>pdavis@nbase-xyplex.com
>www.nbase-xyplex.com
>184 Shuman Blvd., Suite 200
>Naperville, IL. 60563
>Phone: 630-717-2960 x 3072
>FAX: 630-357-4237
>
>