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| DuoDock FPU |
Posted by: bunnspecial on 2016-12-28 10:15:58
I have a DuoDock on the way, and one of the things I noticed in the photos that is that it doesn't look like it has the FPU. I'm not overly familiar with these, but I think that because there's an empty socket on the front left side of the board in the dock.
From what I've found, these used the 68882 FPU. I've found several on Ebay that appear to have the correct pin packaging for the socket, but before buying one I wanted to confirm that it would/wouldn't work in the dock.
Does this look like one that would work?
http://www.ebay.com/itm/MOTOROLA-MC68882FN20A-PLCC68-HCMOS-Enhanced-Floating-Point-/361788721315?hash=item543c49c8a3:g😛dIAAOSwal5YDkpO
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Posted by: Trash80toHP_Mini on 2016-12-28 20:06:13
Which Duo? 270C has its own FPU built in and I don't think the 2300c uses it.
Meanwhile, I think I remember the Dock's clock being 25MHz, could be 20MHz. Dunno I'm tired and couldn't confirm it handily.so make sure whatever FPU you source is rated for the Docking Connector/Dock's clock speed.
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Posted by: bunnspecial on 2016-12-28 21:11:56
The Dock I bought is coming with a 210, but my intent is to use it with a 230 since the 210 reportedly had some issues.Â
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Posted by: Bunsen on 2016-12-29 06:48:24
270C has its own FPU built in ... it does?
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Posted by: Trash80toHP_Mini on 2016-12-29 07:51:43
Yup! [🙂] ]'>
http://lowendmac.com/1993/powerbook-duo-270c/
http://www.everymac.com/systems/apple/powerbook_duo/specs/mac_powerbook_duo270c.html
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Posted by: Bunsen on 2016-12-29 10:34:22
Huh, I never knew that.
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I don't think the 2300c uses it. That much I do recall - the 68882 is only compatible with 030 processors, so the 040 and 603e Duos can't use it.
Which is a darn shame: the only way to get an FPU working with a 280/280c would be to replace the CPU :-/
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