I have an off-market USB to Serial adapter that I do not know the exact company name and have been unable to get the driver that your wrote to work. I am using a iBook G4 with OS 10.3.9 and have been able to get the machine to recognize the device with the PL2303x_1.0.7b4 driver supplied with the cable but it does not work for my application (controlling the Parallax Basic Stamp 2sx micro-controller). The inability of the commercial drivers to connect to the Basic Stamps is a known problem that apparently your driver does not suffer from.
The problem specifically is that when I run the installer (I have used release 0.2.2-10.3.dmg), the files are placed in the proper folders, but when I run 'ls /dev/cu*' I only see /dev/cu.modem. Below I have included the system profile print out as well. What do I have to do to get this to work? and am I able to do it or must I purchase a new adapter? Thanks
Vendor Name: Prolific Technology Inc.
Speed: Up to 12 Mb/sec
Product ID: 8963 ($2303)
Bus Power (mA): 500
At the moment I have no 10.3 release running to test the driver. Maybe you can try to compile the driver by yourself via Xcode. You can checkout the sourcecode via subversion
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