The chip internal programming must work because it programs properly.
The programmer algorithm would have to write the data in a similar
way. (from memory I think this is the case for 18F series)

Have you tried writing a new and simple program that just writes 8
bytes to 0x1840 and then read the chip back in a programmer?

Any floating input pins? - they can cause weird things to happen -
"for some reason it came right twice" :-)

cheers

Tony

On Tue, Oct 11, 2016 at 8:29 AM, IVP <joecolquitt@clear.net.nz> wrote:
>>I wrote this test program and simulated with MPLAB
>
> Thank you for your effort Tony.
>
> Your code does indeed write a block correctly. As did mine,
> which for some reason came right (at least twice anyway) last
> evening
>
> However, the chip will still not write without the block being
> blanked by 0000 at programming time. If I can't solve that
> then anything else is academic
>
> Thanks again
>
> Joe
>
>
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