I'm relatively new to the Mac world and might be missing something obvious. I've looked at the processes running and don't see anything that would use the these adapters. I assume this means that OSX has assigned them to some process, but I can't find out what that is. Seemingly at random the VM will say it can't bind them because they are being used by another process. My second problem is being able to consistantly bind the USB-to-Serial adapters to the VM. No problem in the Mac world since both have been tested to 115.2 Kb. My guess it is either a flow control (handshake) problem, or the transfer buffers are just to small. At this speed, they drop more characters than they pass. They will work with small data bursts, but cannot sustain data flow at even 9600 baud. So far I've purchased two different brands of USB-to-Serial adapters which work great in the Mac world (Intel iMac V4.6), but not in an XP VM.
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March 2023
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