630 motherboard in a 5500

[Durosity]

Yep already blanked off exactly the same way as @pizzigri does it!

 

[MacJunky]

On my 630 that pin is not connected to anything I can find. The top and bottom are not even connected to each other. I used to run 580/630 in a 6500 chassis with no mods and never had any issues as well.

 

[defor]

I'd say I've also had no issues and if you refer to the CCSCC/Takky documentation of the pinout, it appears that pin was left as NC both on harness and boards until they needed to add the +3v.

 

[pizzigri]

i did check my only remaining 630 board, both are indeed NC, however it seems that not all boards leave the leads unconnected. In all 630 compliant machines, harness side those leads are grounded, beginning with the 6360 they provide 3.3v for the PCI slot, but it seems that some of the 630 type LB do have them connected to, uhm something, through R44 and R43. These are not mounted, but if you follow the traces they go through some caps (including C34) and then I lose them towards the RAM slots.
eta image

 

[robin-fo]

Sorry for hijacking this thread, but maybe someone can help me. I have a spare 5200 logic board, a 5500 (?) wiring harness and am contemplating about buying a Quadra 630 video connector. Are they all compatible? I'd like to build a RackMac from these

 

[pizzigri]

Hey Robin, I am not 100% sure the harness is compatible, however if you show me the connectors I may be able to help you. That is because the 5x00 has internal video and I do not remember if it had a different connector to the AB.
if the harness was from any 630 all the way to the 6500 it would work although the video out board of the 64/6500 is improved vs the older ones, so I suggest getting one of these boards instead of the 630

 

[robin-fo]

That's the one I bought: https://www.ebay.ch/itm/386736099457

 

[pizzigri]

Looks pretty much like a standard harness to me. lets see if we get confirmation from someone else just to be on the safe side, however you would need the video out board anyway so….