I have a whole bag of 30pin SIMMS so I thought I would see about upgrading the 1 MB of RAM in my Mac SE FDHD to 4 MB.
The original RAM had four sticks of
OKI M41256A. These SIMMs have 8 chips each.
From my stash of RAM, I found a bunch of Panasonic
MN4A091MOS80 - 1MX9 SIMMs.
These have 9 chips each. Which I THINK that are parity RAM SIMMs.
Also, I switched the jumper on the motherboard to "2/4MB" when previously it was on "1 MB".
When I boot up the system, the Finder shows
2048K. So, only half of what I was suspecting.
My system OS is 6.0.8 and the Finder is 6.1.8 FWIW.
I'm thinking one or both SIMMs are bad in either bank A or bank B.
It's a real pain pulling that board in/out to swap out RAM.
So, before I keep randomly trying many combinations, does anyone know if the OS even supports more than 2 MB?
Do you think the parity RAM could be causing an issue?