I have been using Parallel Port of PC to communicate with controller which uses 2 data pins(as Clock and Data) as inputs and one of the Status pin as output. But Now a days most of the Laptops are not having Parallel ports, So I have purchased BAFO USB to 25 pin Parallel Port Converters. When the converter is conneted to Laptop it is detected as USB printing support instead LPT port, then I started investigation and Finally I understood that first I have to find device path Name using win API functions, then by using CreateFile(), ReadFile(),WriteFile() and DeviceIoControl() I can send and read data to the parallel port. Finally by using VC++ and WinDDK I am able to find the Device Path Name successfully(Called Set of API functions given in USB COMPLETE manual but I fixed GUID name, which I found in usbprint.c file availabe in net) Now the Problem is 1. How to send 8 bit Data to Parallel port (like LPT1 - 0x378 used to send data) 2. How to Read Status Bits from Parallel Port (like LPT1 - 0x379 used to read data) I think ReadFile(),WriteFile() may not work in this case. Please help me.

Personally I prefer Parallel Port Cardbus/Express Cards: http://www.cooldrives.com/software-... http://www.cooldrives.com/1ppaspex3... This would remove the USB/Parallel Conversion difficulty.....

Thanks for the reply, Do I have any alternate Low cost solution with USB.