> Rochester, 10 september 2006.
>
> Dear Frank,
>
> It depends on the chip whether "blank" means all zeroes, or all 0xFFFF. 
> The
> old EEPROM chips would always read back 0xFFFF in unprogrammed state, but
> this isn't necessarily the case with the flash chips. However, most of 
> them
> still do.
>
> However, a verify error with all 0xFFFF generally doesn't mean the chip is
> blank, it means there was a connection failure and your programmer was
> unable to access the chip correctly. You might want to verify all the
> connections.

That is what I did. All the wiring is as it should be, I only left out the 
two ground connections....
I corrected that, but still no success.

>If you're using a serial port programmer without external
> power, you might want to check if that serial port is compliant, in the
> sense that it outputs sufficiently high voltages/currents for the
> programming to take place.

That is what I use, a serial port programmer without external power. I tried 
to measure the voltage with a simple digital voltmeter, seems to be OK.
What I really need is an oscilloscope to check the serial port.

>
> Greetings,
> Maarten Hofman.
> -- 

Thank you!

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