RAM and the Milan is a mystery! I've got 48 MB RAM in my Milan using EDO PS/2 simms. My third ram socket is damaged. I don't know what happend to the socket but it's bent. When I bought the Milan from its former owner the socket was already like this. So no simm is working in that damaged socket. Last autumn I got an old Pentium MMX PC. On the motherboard of that PC were two sockets with 32 MB EDO PS/2 simms in it. So I thought I could use these simms in my Milan. I just took the two 32 MB EDO simms from the PC and one of the 16 MB simms I've already used in my Milan. But the Milan didn't boot with that combination. So I tried the two 32 MB simms only. The Milan didn't boot. Than I tried only one 32 MB RAM simm. It didn't boot! I also tried a combination of one 32 MB simm and a 16 MB simm. It just didn't work. Than I tried all of the three 16 MB EDO simms in different combinations wih the 32 MB simms. No combination worked! So I put back the three 16 MB simms in my Milan. The Milan didn't boot with these simms anymore, either!!!
I thought, that was it! You destroyed the motherboard!!!
But I just remembered that I bought two years ago a little box from ebay with ca. 30 PS/2 simms and a few simms in it. So I took a look at the box and just found four 16 MB simms that might fit into the Milan. I tried one of them an the milan booted again. I placed the next one into the second socket and again the Milan booted! The third simm in the forth socket (the third one is damaged) and the Milan booted. So I still have 48 MB RAM in my Milan but I just don't really know what happend? Were the other simms the destroyed by using the 32 MB simms ? Were the 32 MB RAM simms destroyed by the motherboard? Very, very strange behavior!
So if you want to replace your ram in the Milan, I recommend to remove all the simms from the Milan and just start with one f the new simms in the first socket. This simm must 16 MB or lager. Than remove it and test the next one and the next one and the next. When all simms are working correctly just try them together.
520 ST(M) (TOS 1.02), Falcon030 (16 MHz, 16 MB RAM, CF-Card, MiNT & MyAES), Milan040 (25 MHz, 48 MB RAM, EasyMiNT 1.90), Firebee, PowerMac G5 Late 2005 (2 x 2,3 GHz, Mac OS 10.5), iMac 4K Late 2015 (intel Core i7 4 x 3,3 GHz, Mac OS 10.11.6), IBM XT SFD (640 KB RAM, DR DOS 6.0), Compaq LTE 5300 (Pentium/133 MHz, DR-DOS 7.03), AT-PC (Cyrix 6x86L/200 MHz, Windows 98 SE/MS-DOS 6.22 & Windows 3.11)