Hamilton Feltman wrote:
>
>         Dave:
>
>         I think it has something to do with the initialization of memory
 registers
> 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

I think it's the Answer to Question 1 on Fast Forwards Answers page.
Check out the following URL by Andy Warren:
http://www.geocities.com/SiliconValley/2499/answers.html
Tells you how and why on the most asked PIC related questions.
Commonly asked questions on other micros answered also.
*** Bookmark it. ***

Don McKenzie donmck@labyrinth.net.au
DonTronics Tullamarine, Australia
http://www.labyrinth.net.au/~donmck

SLI, the serial LCD that auto detects baud rates from 30 to 125K bps.
SimmStick(tm) A PIC proto PCB the size of a 30 pin Simm Memory Module.
EASY PIC'n Beginners Guide to using PIC 16/17 MicroChip products.