On Saturday 08 December 2007 17:39, Steve Underwood wrote: > Neil Youngman wrote: > > I would be surprised if the adapter didn't support bidirectional ECP/EPP > > modes, but I could always be wrong. It was advertised as a printer > > adapter. There may be some modes required for scanners that it doesn't > > support, however I suspect that the problem is more likely to be SANE > > assuming that parallel port devices are only found on parallel ports and > > not on USB. Does anyone know if this is the case? > > > > Neil > > Then be prepared to be surprised. A USB serial gadget is a close > emulation of a traditional serial port. A USB parallel gadget is not > even vaguely similar to a traditional parallel port. The huge latency of > USB means it would be impractical for it to work in the same way. This > is a huge pain for a wide range of industrial gadgets, embedded > development tools, and other gizmos which only work with a PC's parallel > port. Even if you try written a custom for the USB gadget, the latency > makes it useless for almost anything.
People seem to be able to able to get scanners working on USB, so I guess you're saying that the USB to parallel port conversion can't be made to work adequately for bidirectional transfers? Neil
