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Hello,

I have a Sivava PC50 programmer and I want to program an Intel D8742 chip.
Unfortunately I always have an error at the first byte when writing.

Any idea? I think I set the board up properly. Any advice is welcome!

Thanks!
Chris

Do you apply external power source ?

Yes, I use a 12V adapter, and put the jumper to provide 21V and Vpp position. I set the dip switches as shown on the software. I didn't plug the USB cable then.

What result on next adress , read chip and look in buffer ? Try measure Vpp and Vcc during D8742 programming .