btw, does someone found pictures of early 386 motherboards? (im talking pre 1987)

the earliest one i found both in pictures and in person was from 1988

https://www.redhill.net.au/c/c-3.php

i what it says on the top articule of the DX-25 its true, there were not many sold and kinda overlaps with the 486

the post card analyser was defect, i tried it on others isa computer. i just bought a new one on amazon with 6 red led instead of 3 led. The 3 led post card looks cheap. we have made new soldering and repaired some lines but it still dont boot. all voltage are good everwhere on the motherboard, even the isa port