What do you guys know about IBM 604e ZIF modules?
About two weeks ago, I found one on eBay and snagged it while I could. It's a 333MHz part. My guess is that it's out of an IBM RS/6000 43p Model 140, but I know next to nothing about IBM's hardware. Anyway, the module is a 289-pin ZIF module (17x17 - same size and pin count as a G3 ZIF). I did a little Googling, and the only mention of 604e ZIF modules I could find was in reference to IBM's Long Trail CHRP concept motherboard that was supposed to be able to run AIX, Mac OS 7.5 (CHRP edition), and Windows NT (check out the attached PDFs: NOT FOUND: 1, NOT FOUND: 2 - I grabbed these from ftp://ftp.boulder.ibm.com/rs6000/PPC_support/reference_designs/longtrail/pass2/).
So, being somewhat curious, I plugged the module into one of my Rev A beige G3s this evening, and...
I'll be damned! It booted right up!
NOT FOUND: 3
I snagged some screenshots to prove that it boots, and both Apple System Profiler and Gauge Pro recognize it as a 604e @ 333MHz (I did have to set the jumper to that configuration, of course). Gauge Pro says the processor version is 1.2, whatever that means.
Sadly, the module doesn't have any L2 cache. So booting a beige G3 with a 604e is really just an academic pursuit. It's not going to win any speed contests against a similarly clocked G3 that does have a proper L2 cache. Though if one could get an L2 cache working with it, it would be interesting to compare apples-to-apples, so to speak, to see what kind of performance the 604e can put up against a G3 in otherwise identical configurations. I'm guessing the 604e would hold it's own...
Anyway, the beige G3 motherboard has all some legacy CHRP stuff like solder pads for PC floppy drives. There's also a set of solder pads for an L2 cache DIMM. The Long Trail design was supposed to use ZIF-socketed 603e & 604e processors with a COASt (Cache on a Stick, whatever that is) L2 module. The solder pads of this missing L2 cache slot and the installed slots on PCI Macs are indistinguishable in comparison by me. I've speculated before about whether or not the slot would be active if someone actually installed a cache module there. Now I'm even more curious. And what is this COASt L2 module thingy? Is that what the PCI Macs use?
I guess the point of this post (besides rambling) is to share what I learned about the Long Trail design, to speculate on how Long Trail might have influenced the Gossamer motherboard design, and to ask what else you smart people know about IBM ZIF modules, where I could get them, and if any 604e ZIF modules have on-board L2 cache...
(Note to mods: I tried to attach files and use the "inline" tags, but the preview looks messy. Can you fix it for me if I did it wrong?)