I have a small IBM 390 which I haven't been able to find out much, but I did spot while searching that my 1999 S/390 has a 256 byte cache line. That's 4x over

I have a small IBM 390 which I haven't been able to find out much, but I did spot while searching that my 1999 S/390 has a 256 byte cache line. That's 4x over a 2020 i7.