> That makes me wonder: what is the realistic datarate of a 1,5 MB/sec UHCI > connection? Is it really 1,5 MB of transferred data or more like 1/3 of that > (0.5MB/sec) as is the case in USB 2.0?
It is similar to USB 2 in that respect, but USB 1 is even a little less efficient than USB 2 in some aspects. For example, the maximum number of bytes that can be transferred in a single USB 1 packet (for something like a disk) is only 64 bytes, while in USB 2 it is 512 bytes. But there is so much overhead (framing, flow control, timing, synchronizaton, queueing, packet prioritization, error detection & correction, etc.) in USB that you can never even get close to the bus speed (12 Mbps or 1.5 MBps in USB 1) with the amount of actual data being transferred. The problem even gets worse when you have more than one device on the same bus. _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
