PM-41(2) PAL different layout

[klode82]

I cannot find all points to made solders on my PCB. I'm working with an Arduino Nano with ATMega.

This is the PCB: https://imgur.com/tgAdHI5

[ramapcsx2]

Try this:
https://i.imgur.com/68TnVRw.jpg

You can't see both points for pin4/pin5, but they are the BIOS patch.
In this method, both points don't connect to the actual BIOS chip, but to test points near the CPU. This works just as well and saves space.
Beep them out with your multimeter.

[klode82]

Thanks a lot!, but is not too easy understand where the wired are connected on the Nano, and a wire is hidden (the pins 4 and 5...)
Thanks to your image, I've realized this one.

https://imgur.com/a/g9mkhkB

Please, can you help me to identify D4 and D5?

Thanks.

[ramapcsx2]

Sorry, I don't have a board out to find the pins.
Use your multimeter to find out where the BIOS pins A18 and D2 route to on the mainboard.
And if you don't have a multimeter, you have to get one in any case ;p

[klode82]

Don't worry, I've found all Pins.

https://imgur.com/vJZQBQL

I'll try as soon as possible.