I have the same issue as you. Using a PowerBook 2400c I get that same error message, but my ColorClassic can print just fine to it. The ColorClassic (with 10 mb ram) is running system 7.6.1, and the PowerBook 2400c (with 80mb ram) is running os 9.1. It is a bit of a bummer at this point as the ColorClassic is beginning to have a video issue if I try starting it up after being plugged in for more than a few hours. I feel like soon I won't be able to ever use this printer again.
If you find a solution I'd like to hear about it! However I believe it is most likely a blown serial port on the PowerBook.
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I have the same issue as you. Using a PowerBook 2400c I get that same error message, but my ColorClassic can print just fine to it. The ColorClassic (with 10 mb ram) is running system 7.6.1, and the PowerBook 2400c (with 80mb ram) is running os 9.1. It is a bit of a bummer at this point as the ColorClassic is beginning to have a video issue if I try starting it up after being plugged in for more than a few hours. I feel like soon I won't be able to ever use this printer again.
If you find a solution I'd like to hear about it! However I believe it is most likely a blown serial port on the PowerBook.