Dave:

        I think it has something to do with the initialization of memory registe
rs
before a read.  For example; do not count on the fact that a register will
read a `zero' before you have written one in there!
p.s. You might want to check the microchip web site, I remember seeing
something about it there.

        Hamilton

At 08:01 PM 1/11/97 -0800, you wrote:
>Thanks for the help last night figuring out why GP2 for the PIC12C508
>kept acting like an input only port.  Now I have another frustrating problem.
>
>  I've programmed and debugged my code using a PIC12C508/JW part.  Everything
>works fine.  I then put in a OTP '508 in my programmer.  It programmed and
>verified fine but when I put it in my target circuit it doesn't work at all!
>
>  I erased my JW part, programmed it, put it in the circuit and verified
>everything
>was still working. . it was.  I then programmed ANOTHER OTP '508, verified
ok,
>put it in the circuit and NOTHING!!!
>
>Any ideas?  The JW part is 9648SAT date code, the OTP's are 9649SAN.  The
>programmer
>is the Parallax PIC16CXX programmer and I'm using SPASM 4.7 and SPEP 4.7,
>firmware
>4.2.
>
>Anyone been successful programming OTP using the Parallax programmer?
>
>Thanks
>Dave
>
>