TX486DLC-33GA on FM Towns model2 (Tower Gen1) - problems

[amazin]

Hello friends, I got a TI TX486DLC/33GA, installed on my 1st gen model2 tower, and it worked, but the floppies went completely crazy (couldn't format disks), some games started to display lots of corruption on screen, so I went back to the original 386DX.

I haven't changed anything but extracting the original CPU and dropping in the new one.

Shouldn't it have "just worked" ?

This is what I got:

The CPU:


Before (with the original 386DX16)


After (with the 486DLC33GA)


Any ideas?

Thanks in advance