The fakes are quite common in the cheap translucent USB to serial converters. Prolific has an warning about the fake chips in their website too. And usually those fake copies work quite well with Linux. Lots of cheap product claiming to have PL2303 do not work with new driver, but they could work better with old driver (if you want to gamble that option). Note: How to not get scammed with Prolific (PL2303) USB – Serial adapters forum discussion tells that the latest Prolific driver has strict chip identification code in it: If the Prolific chip in your adapter is a fake copy, the driver does not work with it: “This device cannot start. Prolific ( PL2303) adapter is an common solution about USB to Serial port adapters. It is bad news if your hardware has counterfeit ICs in it. It seems that two big USB-serial converter chip manufacturers have come up with their own fight against counterfeits, which is could be viewed both good and bad. Counterfeit electronics components are a serious problem to electronics and chip manufacurers. And it seems that in the future they cause even more headaches. Counterfeit copies of USB to serial ICs have caused headaches for users and manufacurers. We love that we can add serial port to a new PC, but we hate that many of those adapters do not feel reliable in use. USB to serial port adapters are gadgets that we have a love/hate relationship.
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