Motherboard Compatibility between LC 580 and Later Systems

[Zhinü]

Are the motherboards from later AIO systems (5200, 5500, etc) compatible with the LC 580?

I know that the LC 520/550/575 don’t support it without heavy case modding and cable rewire (that’s why they work with CCs), but the LC 580 has a harness cable that looks similar to the later macs.

I would test it myself (I own a LC 580) but I gave away the 5260 board I was saving.

 

[Phipli]

You have to mod the wiring harness a little - they added 3.3V to the PCI boards. It can be done though and there are pinouts / instructions online.

 

[Zhinü]

You have to mod the wiring harness a little - they added 3.3V to the PCI boards. It can be done though and there are pinouts / instructions online.

I’ve seen it done to “Takky” CCs, but I don’t think i’ve seen it to upgrade LC580s.

I also noticed that on the Takky website it does mention that the 5200/5300 motherboards do not need 3.3V. Do they actually?

 

[Phipli]

I’ve seen it done to “Takky” CCs, but I don’t think i’ve seen it to upgrade LC580s.

I also noticed that on the Takky website it does mention that the 5200/5300 motherboards do not need 3.3V. Do they actually?

I believe you don't need 3.3v if you're not using PCI, but I'm not certain what is connected where the 3.3v would be. You'd want to check to make sure it wouldn't cause a short. Its years since I was reading about it so probably best for someone else to give details if you can't see the answer in an old thread. I think someone asked something similar a couple of weeks ago.

 

[Phipli]

This is a similar discussion:

Performa 5400 board in LC 630

I recently acquired a Performa 5400 motherboard. Would it work in a 630, or a 6200/6300?

68kmla.org

 

[Zhinü]

I noticed that one of them mentioned “see sig” so I assume there’s a chart or something that determines that?

As for 3.3V, I see that the only location the 3.3V goes to is P8 on the power header on the motherboard. I unfortunately don’t have the pinout for the LC580 boards though. (It’s on the Takky website, can’t seem to send the image though.)

Takky | powercc.org

A Takky Upgrade is to fit a logicboard of a PowerPC into the Apple Color Classic. It gives you much more Power than the original components.

powercc.org