Atari ST upgrade ram

[Anemos]

Petari, have you some easy and complete diagram or (how to) upgrade ram with 72pin simm SDram or something else ?
I have one 1040 ST ,and im thinking to upgrade ..

[Petari]

I did it 2x long time ago, around 1992. But made no schematics or any other doc. Basically, you need to connect by logic. Signal names are pretty well standard, so RAS go to RAS, CAS to CAS, A1 to A1 

No SD RAM (it is not available in 72 pin moduls, btw). And no even EDO RAM. Only old type ordinary RAM, called sometimes FP RAM. But it is hard to find in 72 pin version - most is EDO.

So, first you need proper RAM module(s). Maybe is better to go on 4x30 pin SIM modules (4x1MB). More chances for proper RAM (non-EDO).

And google little around - there are some solutions online.

[Anemos]

FP RAM = fast page ram.. you have right that is compatible..
ok i will searching around..