The serial port is 115.2kbps, not kBytes per second. Given the transmission is async, you are getting 10 bits per char, so it is more like 11kBytes/sec. You can make 100ns highs and lows on the parallel port with a good driver, so the port is capable of 5Mbytes per sec. However, it is likely that in real life speeds of 2Mbytes/sec is the upper limit. I'm going to pick up a usb cable today and just do the test. There is nothing like a real life comparison. > > Well whoever you talked to is wrong. Here are the data transfer rates for > various port types: > > Parallel (ECP/EPP): > 800KB-2MB per second depending on device type. > > Serial: > Up to 115.2 KB per second > > USB 1.0: > 12 Mbps (1.5 MB per second) > > So, depending on the device, USB cab can be almost 2 times faster than parallel, > but parallel can also be faster than USB. > > But what you write about 10x faster makes no sense. I run a 133 mhz Pent box and > an EX and 3000 from parallel connections. I'm almost running at engine speed. > "Engine speed" is the speed at which the printer can operate with no pauses at > the end of each swipe of the print head. If your print head is moving back and > forth across the sheet with no pauses until the end of the print job, then it is > printing at engine speed and is printing as fast as it possibly can print > regardless of what it's connected to. > > > > Tim M > > > > - > > Please: Stay on topic. Trim quoted messages. > > http://www.leben.com/lists for list instructions. > > > > -- > Mike Greer > > Come visit my web site on digital photography and other > interesting topics at http://greer.simplenet.com . > I have been extremely lazy, so many of the topics are > not finished yet. But they will be, some day. > > > - > Please: Stay on topic. Trim quoted messages. > http://www.leben.com/lists for list instructions. > - Please: Stay on topic. Trim quoted messages. http://www.leben.com/lists for list instructions.