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I have Lattice GAL20V8B chips from aliexpress and afterburner programs them without any problems (at 12.5V). I also have AE GAL20V8 from ebay and with those I have no luck....

Indeed the pins have to be remapped, without that nothing will work, but that was done. The original file is like this. It works with afterburner without any problems as...

This is what I bought on aliexpress, and now I see that on the picture it is not really lattice but I got 10 chips with a nice label Lattice...

Thanks for the update! Indeed, I just wired afterburner only for GAL20V8, because I only needed that. I followed the pinout from here, where the pin1 was grounded without any...

One thing that I remembered actually, when I was erasing that AE chip, I could read all "1" properly in a nice table, still with PES all zero. Only after...

I tried that solution before (with 5) but it did not work. Also on that website that I mentioned before about 20V8 the strobe during the reading is 5 microseconds...

Problem solved :))) I managed to find the datasheet for GAL20V8 from national, and one one page "2-36" I found very small note below one of the diagrams on preloading....

Good to hear that it was helpful! I found that note in this datasheet (page 2-36) https://www.amigawiki.org/lib/exe/fetch.php?media=de:parts:gal_nsc_20v8_a.pdf I checked also a datasheet from Lattice but I have not seen such...

Just tested and indeed it works with Arduino's internal pullup on SDOUT!

In my experience it works good so far with GAL20V8. There is no difference in terms of programming protocol between 20v8 and 16v8 I believe. I also killed one of...