Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

bunnspecial

macrumors G3
Original poster
May 3, 2014
8,356
6,497
Kentucky
I decided to go through my "miscellaneous memory" drawer last night and get it organized-a task I've been putting off for a long time.

Much to my pleasant surprise I found a couple of 64mb 60ns FPM 168 DIMMs, but that's a story for another day.

In any case, I had three matched pairs of 72 pin SIMMs, and I'd like to install at least some of them in my 7100.

Everything I found was 60ns, so from that standpoint they should be fine as the 7100 calls for 80ns.

As far as capacity, the sticks I have are 8mb(x2), 16mb(x2) and 64mb(x2).

Most of the references I find for the 7100 say that it accepts a maximum of 4x 32mb SIMMS. I'm wondering what chance the 64mb have of a. working and b. being recognized at full capacity. Or, more specifically, was the 32mb module size limit put in place because of what was available at the time the computer was made(as I know Apple often did then and still does now) or is it a real limit of the logic board/memory controller?
 
Thanks-since I have them on hand I'll take the "try it and see" approach...

If this were my 8500(which I have more RAM for, but have put off upgrading) I wouldn't do that. Since the ram is at least relatively accessible in the 7100, I'll give it a shot(and report my results back here).
 
I broke the computer down and installed 2x32mb and 2x64mb.

On booting, it's only reporting 104mb...if my math is right, that's 1x32mb, 1x64mb, and the 8mb onboard. Or, possibly it's reading the 64s as 32s and not reading one of the 32mbs(or one of the 64mbs)

It's running OS 8.1, which doesn't have the nice system profiler of OS 9 that breaks things down by ram socket so I can see what's working and what's not.

I guess I need to get back to the ram sockets and at least blow them out good...
 
Odd.

I used to use an LC475 for testing 72pin SIMMs (can be used one at a time).

TechTool Pro 3.0.x should be able to show you the RAM configuration.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.