I am puzzled by the issues raised of DMA and interrupts as a problem in using
USB.
In the WinXP system a common way of using USB connections is to handle it as a
'Virtual Comm Port' (VCP). When you plug in your USB device it is assigned a
Comm port number. After that the data link behaves exactly like a full duplex
RS232 link.
Also if you do a Google search you will find several venders selling USB to
Printer Port converters. These enable printers without USB capability to be run
from laptops without printer ports.
So why cannot EMC use a USB port exactly like it uses the printer port?
Obviously you need the equivalent of a WinXP Virtual Com Port driver. Is that
so difficult to produce?
The main attraction of the USB connection is that much higher data rates are
possible.
______________________________________________________________
John Harris
E-mail: [EMAIL PROTECTED]
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