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ADB Hotswapping


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  • 68kMLA Supporter

Then there's FireWire... Supposed to be hot pluggable, but easy for careless people to fry things. I remember countless DV camcorders with fried FireWire ports and a few that were completely dead from students and staff misaligning the 6 pin plug when connecting to the computer's powered port. The cameras all had a 4 pin unpowered connection, so it seems there was no protection there. The user would invert the plug when connecting to the computer, powering the data lines on the device. On eMacs and iBooks, it would kill the FireWire port on the computer rather than the camera, blowing a fuse that could be desoldered and replaced. The ubiquitous iMac G3 slot loaders would wreck the cameras. We tried to institute a policy of connecting the cable to the computer first to avoid the mismatch, but... I ended up having to solve the problem by hot gluing cables to computers. Sometimes behaviour has to be modified by the environment.

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are you suggesting they blew them some other way besides hot swapping? (Urinating on the port? Probing it with a bent paperclip?)

 

This is the 21st century... If it sounds too stupid to be done, there is every chance somebody has done it! lol

 

Kinda like Rule 34... But not pertaining to pr0n in this instance.

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  • 68kMLA Supporter

Exactly.   You have no idea what caused that fuse to blow... so using it against me to make your conspiracy is moot.

 

people do stupid crap,  but hot plugging ADB is not one of them.

I explained the exact mechanism that blows the fuse. It's simple physics.

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If we want specifics.

 

I have only changed (2) ADB fuses and they were physically blown, as in you could see it.

And they were the earlier Revision SE/30... The shape was round yellow and disk like.. about the size of a dime.

 

Other wise I haven't had to change any of the other style of fuses.

 

post-1852-0-54668800-1446676012.png

post-1852-0-88655900-1446676039.png

 

and have never had to change an ADB controller.

and never had ADB issues with any MB other then with that specific SE/30 RevA's, and that round

disk like fuse they used for a short period of time.

 

I have re-capped so many boards its just obscene.  I wouldn't lie just to prove a point.

Its just fact that i am absolutely correct.

 

Hot plugging ADB does absolutely nothing to harm your main board other then maybe slow your mouse speed down when you plug it back into the original machine. Witch gets fixed with a reboot.

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I think we have to look at it this way. Has anyone blown an ADB device or ADB connection on a logic board by swapping with a system that is powered down?

 

If the answer is "no", and we have at least anecdotal evidence that it has happened when people tried to hot-swap, we have to accept that hot-swapping does indeed carry some risk above that seen with swapping cords while system is off.

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  • 68kMLA Supporter

I have no qualms about hotswapping ADB. at a MUG event ten years ago, a veteran AASP shop owner compared it to speeding:

"You're not supposed to do it, but pretty much everybody does. The difference is that the Mac probably won't crash."

 

The only ADB failures he could recall were related to S-VHS/S-Video equipment being connected to the ADB chain.

 

If I cause damage to a machine by my own actions, I'll admit my stupidity and take responsibility. I take no responsibility if someone else takes this as advice and causes a catastrophic cascading global telecommunications and power grid failure by hot plugging ADB to a toaster.

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  • 68kMLA Supporter

No, ADB's not hot swappable per the spec. It's a maybe you can do it without damage, but really should not. That said, mechanical the KVM switches do it, but the rotary switch likely reduces the chance of damage significantly over hot plugging ADB manually.BTW: Peripherals would be the forum of choice.

Here's a link to an ADB 4 way switch currently available on eBay. http://www.ebay.com.au/ulk/itm/252153542078

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Heh! Forbidden fruit. [ :o)]

 

I successfully hot swapped my ADB keyboard and mouse between my Macintosh II and LC III today. It was great! Then the Mac IIs hard drive died. So all in all, a total fail of a day but at least ADB hot swapping worked!

 

 

 

This thread just keeps on delivering... I love it! :D

Edited by Schmoburger
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