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| Author | Logic board compatibility (Read 82433 times) | ||||||||||||||||||||||||||||||
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ShinobiKenobi
256 MB  Posts: 362 System 7 fan 
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on: December 13, 2024, 02:25
Does anyone know if there's a way to check if a specific logic board will work with a specific Mac? I have a logic board from an LC 575 that I scavenged from somewhere years ago and held onto it in case I could use it. It needs some TLC, however  and it might be too far gone... some pins are corroding, so I probably shouldn't, and there is a slot on it that is physically broken.Also, I was curious what the names are for the connectors on the logic boards that slide into some AIO Macs. I compared the LC 575 board to the one out of my Performa 5200CD, and it looks like it's flipped horizontally, and is shorter in width. I found a very informative site here while I was searching. Not sure if it needs a modern browser... I'm on my i7 6700K right now. |
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Last Edit: December 14, 2024, 22:37 by ShinobiKenobi
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lauland
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512 MB Posts: 674 Symtes 7 Mewconer!
Reply #1 on: December 13, 2024, 17:10
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And not just the AIO's: I have a Performa 6360 case that I regularly swap the original motherboard out with a Performa 630's. That way I can switch between real native PPC and M68k (using the same hard drive!). The 6360 is a variant of the 4400 (and thus PCI and not as crippled as the identical looking 6200/6300's), and they could share motherboards, taking into account the different back bracket. I don't have a 6200/6300 motherboard, but am sure it would work in my 6360's case also. I am pretty sure, but not positive, that the same (or compatible or very similar) slide-in motherboard connector as mine is used on most of the AIO's and even the Color Classic (which is how the "Mystic Upgrade" where you use a LC575's motherboard is possible). One thing to maybe be aware of is load on the power supplies. A case may not necessarily be able to handle the requirements of a particular motherboard. It's only an educated guess providing caution on my part, but I would never, for example, try my 6360's board in a 630's case. (Does a PCI PPC 603 really use more power than a NuBus M68k '040? You'd think probably, eh?). Real world tolerance is probably pretty wide, but it doesn't pay to take too many gambles with classic decades old hardware!
Last Edit: December 13, 2024, 17:12 by lauland
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ShinobiKenobi
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256 MB Posts: 362 System 7 fan
Reply #2 on: December 14, 2024, 21:52
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Thanks for that useful information. I didn't think about the power requirements - that's a very good point. That's pretty awesome being able to switch between PPC and M68K quickly like that. I was looking for more information last night about AppleTalk, when I rediscovered the LEM page about the 5200CD. It said the best upgrade for one is to replace the logic board with one from a 6360 haha...
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lauland
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512 MB Posts: 674 Symtes 7 Mewconer!
Reply #3 on: December 15, 2024, 03:16
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If the 6360 one works, then the 4400 (and similar) will too, if you take off the back bracket. I think the only real difference is how many slots the PCI riser has on it. My setup is actually even weirder...the 630 board has the "DOS Compatible" option installed, I've never tried anything than DOS/Win3.1 with it, but it is quite nice for what it is. The design is really bizarre compared to other Apple "DOS Compatible" cards...it's in more than one piece and plugs into multiple connectors on the motherboard, including the '040's "slot", so you have to pull your cpu out and reinstall it on the main board. It uses the same disk container format and drivers as the others, since the chipsets are the same, I'm guessing. (I've swapped between it and my 6100 with DOS card). When I absolutely need DOS or 16 bit Windows, it is my go to machine, very friendly and easy to use.
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Bolkonskij
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Administrator 1024 MB  Posts: 2023
Reply #4 on: December 15, 2024, 10:33
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I have to chuckle reading this because in a way, this is kind of what Apple always wanted to avoid - the IBM compatible approach to things :-) But I find it highly interesting. Actually, a list of compatible logicboard updates would make a nice addition to the System 7 Today webpage so one could always easily look it up. Anyone interested in creating such a list ?
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lauland
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512 MB Posts: 674 Symtes 7 Mewconer!
Reply #5 on: December 16, 2024, 00:55
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I'll add a few I've personally done and use: Centris 650 and Quadra 800. I think CPU speed is the only real difference. My quadra died, and was reborn with a centris motherboard. PowerMac 7500/7600/8500 series in general (but not beyond). The 7500 has a 601 on a card that can take a 7600/8500's 604. The 7600 board is mostly an 8500's without the video out chips. Pretty sure the 7300 is a 7600's without the video in chips. I'd make an educated guess that a 7500 series board would work in a 7200, since the case is so similar. (But just a guess). Some, but not all, Mac Classic and Classic II's use the same case/analog-board, so can swap motherboards. The ones that are different MIGHT work. I have a powerbook 170 and 180, both cobbled together from a box of about a dozen different "dead" machines from an old mac repair shop (came with former owner names on labels!). I'm pretty sure they include parts of other related powerbooks. I do know you CAN'T swap between the monochrome and greyscale ones, but probably among each "family". I just kept putting bits together and was pleasantly surprised when I ended up with exactly one of each that are very solid. ---- The very first (but only that) G4 (codenamed "Yikes!") was just a hack of a B&W G3, so those can swap. Probably most of the "LC" form factors use the same or extremely similar cases, if the power supply can handle it, you can likely swap them. (I've never tried). There were a WHOLE lot of "official apple upgrades", some of which were just motherboard swaps. Like probably the Mac IIci->Quadra 700. The Powerbook 190 and 5300 can probably swap this way. Some might have included new power supplies? And, most of the Performas were just rebadges of other existing models. Usually they weren't even less powerful, but sometimes they'd be missing cache cards, etc. Because they weren't so different, you don't get much of an upgrade if you swapped, but you could. (My PowerMac 6100 has a Performa case because its original shattered). ---- Then there are some you'd swear should work, but have different power connectors, etc. I've got two very similar G4 tower boards, but one has a different power connector (more pins)...even though both have the apple AGP that can power an apple studio monitor with the right connector (which is what you might guess is the difference). ---- Even with the ones that "work" there are gotchas when you're going between very different cases or form factors. Things like the power button and speaker connection may need to be rewired or in the wrong places. And, of course SCSI and floppy cables may not be long enough, etc. I ran into exactly this with my Centris/Quadra and 7600/8500.
Last Edit: December 16, 2024, 01:18 by lauland
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ovalking
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128 MB Posts: 199
Reply #6 on: December 16, 2024, 12:09
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>PowerMac 7500/7600/8500 series in general (but not beyond). The 7500 has a 601 on a card that can take a 7600/8500's 604. Love the processor on daughter board design of these machines that extends their life and value - great for the user, but not so good if you want to sell new machines. I recall the 8600 board fits physically in a 7500, but the PSU connection is different. I think it might match the 7300 PSU (but I've never had one to check).
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ShinobiKenobi
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256 MB Posts: 362 System 7 fan
Reply #7 on: December 19, 2024, 00:41
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That's a good idea Bolkonskij. That would be be a nice resource to have in one convenient location. That's a lot of really helpful info lauland! I've thought about getting a different motherboard for the 7200.
Last Edit: December 30, 2024, 08:38 by ShinobiKenobi
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