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Update Keyspan drivers to fix Classic lockups System
I was wondering why Classic was failing on my machine -- causing a hard lockup -- and perusing the Apple support discussion groups gave me a big hint: I had v1.3 of the Keyspan USB serial adapter for OS X installed, and for reasons not quite known, this driver prevented Classic from starting and/or caused the crashese.

The fix? Go to Keyspan's website and get driver version v1.4b9 (only for Jaguar, not 10.1.5 or earlier!!). A quick install, and now I have Classic back...
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Update Keyspan drivers to fix Classic lockups | 3 comments | Create New Account
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Keyspan driver v1.4b9 Not ONLY for Jaguar
Authored by: gethigh on Sep 01, '02 01:17:15AM

This update also works for 10.1.5......I personally tried it and it fixed the Classic lockup problem on my 10.1.5.

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Keyspan Driver and Palm Desktop
Authored by: jonro on Sep 01, '02 01:33:03AM

Thank goodness for this hint. I had a problem with Classic freezing the computer, but it didn't seem to be related to the Keyspan driver. My computer locked up hard whenever I started Classic. When I uninstalled the Palm desktop software, everything worked OK. Additionally, the lock-up only occurred from my main login name, not from any others. Anyway, this hint seemed close enough to my situation to try it (and I was not aware of new Keyspan drivers for Jaguar). At any rate, everything seems to be working properly now.

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Update Keyspan drivers to fix Classic lockups
Authored by: voldenuit on Jan 21, '05 06:48:13PM

I am in the process of reverse-engeneering a classic app that uses a Keyspan adapter to communicate with the device it controls.
Then I need to work i OS X, using the same adapter.

To switch from OS X to classic, I run this command:

sudo kextunload -b com.keyspan.iokit.usb.KeyspanUSAdriver

before I briefly unplug the adapter, then start classic (with the Keyspan driver installed).

From classic to OS X, I stop classic, briefly unplug the adapter, then I run this command:

sudo kextload -b com.keyspan.iokit.usb.KeyspanUSAdriver

This works extremely well and avoids to reboot for no good reason.
Keyspan still updates the OS X driver, it has reached version 1.8 by now.

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