First version of RAM board for Atari ST ATX
RAM is desoldered from old 72pin SIMM modules.

Tested and 100% compatible chips:.

Eagle files:
Atari ST 4MB RAM.sch
Atari ST 4MB RAM.brd
gerbers.zip

At this moment I can confirm working chips: GM2618165BJ-6, VG2618160BJ-6, HY5118160, KM416C1200AJ-7
It looks like chips with 0 and 1 at the end of numbers are FPM, and chips with 3, 4, 5 and 9 are EDO.
FPM works correct, EDO are incorrect.
The only exception is Gericom - I don't know why.

Some more information and datasheets:
HYB5118160BSJ-50.pdf
HYB5118165BJ-60.pdf
VG2618160BJ.pdf
memory old.pdf
Memory Samsung.pdf

http://www.tomkii.net/tech/SIMM72/
Mirror: simm72.html/