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| Is the Quadra 610 Quaddoubler supposed to work in an LC475? |
Posted by: d3jsp on 2026-02-09 23:26:15
Does anyone know if the 605/610 quaddoubler will work in an LC475? Tried it on mine but it will not chime or boot. I thought the architecture of an LC475 is identical to the Quadra 605 |
Posted by: Phipli on 2026-02-10 00:36:31
Does anyone know if the 605/610 quaddoubler will work in an LC475? Tried it on mine but it will not chime or boot. I thought the architecture of an LC475 is identical to the Quadra 605 Yeah, it should work. The only difference is that the memory performance is a tiny bit better on the 605, but that wouldn't impact your upgrade. If you want to be absolutely sure, remove the little jumper next to the hard disk power connector on the logicboard and your 605 becomes a 475.
One question - is your 605 overclocked?
Edit - sorry, I see you have a 475. I got muddled. Same thing, just add the jumper to turn a 475 into a 605. |
Posted by: d3jsp on 2026-02-10 00:57:18
It's not overclocked, just a stock LC 475 but won't boot with a quaddoubler. It does say 610-U1 on the gal chip though |
Posted by: Phipli on 2026-02-10 00:58:58
It's not overclocked, just a stock LC 475 but won't boot with a quaddoubler. It does say 610-U1 on the gal chip though To be clear, a 610 is much more different. But should probably still work. |
Posted by: d3jsp on 2026-02-10 00:59:05
is that J18? There is nothing on J18 for me and still shows up as an LC 475 |
Posted by: Phipli on 2026-02-10 01:03:23
is that J18? There is nothing on J18 for me and still shows up as an LC 475 Yeah, I got muddled and thought you had a 605. Add a jumper to become a 605. |
Posted by: d3jsp on 2026-02-10 01:37:06
Ahh got it! Unfortunately it still will not chime with the pin and showing up as a Quadra 605 with the original 25 MHZ CPU. I guess maybe the 68040 on the quaddoubler is dead? Can I replace it with another 68040 or LC040 chip? |
Posted by: Phipli on 2026-02-10 02:01:30
Ahh got it! Unfortunately it still will not chime with the pin and showing up as a Quadra 605 with the original 25 MHZ CPU. I guess maybe the 68040 on the quaddoubler is dead? Can I replace it with another 68040 or LC040 chip? You could swap the QuadDoubler's CPU into the LC's socket? To test it that is. |
Posted by: d3jsp on 2026-02-10 03:32:49
I can try! would that boot on a 475? |
Posted by: Phipli on 2026-02-10 03:39:53
I can try! would that boot on a 475? If it is an 040 with pins yes. The only ones that don't work properly are weird ones that you wouldn't expect in the QuadDoubler like the low voltage versions and the ones without a memory manager.
It should be a higher speed grade, but that only means you're running it way slower than it could go.
Let us know how it goes. |
Posted by: d3jsp on 2026-02-10 04:16:17
The CPU indeed does boot! running at 25mhz with a co-processor. That means something else on the quaddoubler is defective or just not compatible with the LC? |
Posted by: Phipli on 2026-02-10 04:22:26
The CPU indeed does boot! running at 25mhz with a co-processor. That means something else on the quaddoubler is defective or just not compatible with the LC? Possibly - I'd start by sharing high resolution, well lit, photos of the top and the bottom of the QuadDoubler. If possible natural light. |
Posted by: d3jsp on 2026-02-10 04:28:03
Attaching some full res pictures |
Posted by: Phipli on 2026-02-10 04:37:53
It doesn't look too bad @d3jsp so I'll leave it to others to point out anything they spot.
Can you solder? The next thing I'd try is clocking the LC down to 20MHz. This means if your QuadDoubler was designed for a 20MHz Centris 610 and by bad luck can't handle a 25MHz bus, it will start working.
If that is the case, there might be better ways to speed up your 475. |
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