This is going even better for those who fail to reball first time there is second chance. Vrams on rsx are one of case rsx fail to understand better what is happening. I've recovered 7 of 7 40nm rsx now by replace Vrams on rsx. How? Simply one manual cnc mf70 and cut down to 01mm each ram. Now I still scrap that rest of epoxy resin with fiberglass pcb and mg chemicals paint remover(3 hours of scraping) . Still need to think buy one good 80 w laser engraver to burn it automatically.
Now about rams most of them I will test this they are all in xbox 360 on gpu side for those who want to test.
On all my test I bought new sets from Aliexpress new ic set of 7 dollars.
I still wonder what Sony tried to hide that time.
I seen something like test pads on edge of rsx under epoxy/paint mask.
Test left for later 65nm first attempt didn't succes (rsx passed from 3034 /4401 to special glod on normal state, remove, scraped rams second reball still special reball, swapped with another 40nm rsx scraped vram working flawless).
Another test I wish is old 90nm rsx with scrap vram and see if those vrams from 40nm will work. Theoretical should if not I've seen on old xbox 360 same tipe of vram, those models without hdmi port.
Anyway if anyone manage to test all that please let me know. For those who want to test/swap rsx in slims not sure if that was documented, probably most guys friends with Computer Booter found early.
Address of eepcsum is on 7FE
After we add rsx flex IO on 182 and rsx id on 194 we write csum swapped at 7FE (reversed bits as we get on eepcsum). It's always at 7fe.
Not sure if Felix had time to integrate this stage in his tutorial but may help other techs.
Example:
https://s.go.ro/90kk3k6z