I bought on eBay a 520 ST from August 1985 (separate power supply and floppy disk drive). I can not get a readable display on my color screen (this is not a screen issue, it works well with a 520 STE). I wanted to disassemble it for but I was blocked by the armor plate that was welded on each side. After un-bidding, I was able to access the motherboard.
I was surprised that the version of the motherboard seemed earlier than I could find on the Web: C070115 REV.2B
the first Atari 520/260 ST have a higher version number: C070243
I have many qustions :
Is there a complete list of Atari ST motherboard versions?
What is this version number, how to decrypt it?
For information, it is AZERTY (French) keyboard. The serial number below the box is : A1 1007193 8 1985
I enclose some photos, thank you in advance for your answers :https://ibb.co/kiPBFKhttps://ibb.co/cuyz2zhttps://ibb.co/gommhz
Thierry (from France)