Ok I just found out that my Agnus 8372A is full ECS Agnus that supports 1MB Chip RAM, only ones that support 2MB are 8372AB and 8375. I have two 8375 Agnus chips, both tested working in real A500+ but when I put them in my motherboard it just doesn't start up. Very strange. I'm wondering if it has anything to do with jumpers? When soldering my actual memory I had to cut JP4, and switch JP2 and JP7A. I just spotted there are 3 jumpers labeled JP5 just next to Agnus. I can't find any information about them - does anybody know what is this one for?