My 164 is running fine, I have 64MB in it, and want to upgrade to 128,
with the 256bit path.

here is the usual might be dumb part:
In the board now I have 60ns, 4x36, 72pin simms. Lots of chips on the 
simms.

I have some 4Mx36 ram simms, 60NS, 12 chips on the simms, 8 that look 
like the same old 1x ram chips AND then 4 additional chips on the back.

These are supposed to be 36bit but I am trying to figure out what the
layout would be, I can assume that they could be 8 16Mb chips, and then
4-4Mb chips.  this seems to jive with what I see, on the back the 4
chips
say 4000-60, but I can not read the lettering on the front chips.

I am interested in what kind of 36bit simms you folks have seen, what
kind seem to work in a pc164.

Any hints, greatly appreciated.
tahnks
bob