BIOS SETTINGS for parallel port and serial port interfacing
This tutorial is taken from the book MY EXPERIENCE IN PARALLEL PORT INTERFACING. you can download it free from the files section(file:-parallelport(3 files) of yahoo group-booksbybibin http://groups.yahoo.com/group/booksbybibin/ comments about this book on www.booksbybibin.blogspot.com BIOS SETTINGS Till now we have talk about the registers of parallel port. Now let's start to do something. Bios Setting is the most important point to note while doing interfacing. If you don't set BIOS parallel port option data won't reach the port correctly. Here are the settings i used for my motherboard Motherboard used:INTEL845GVSR In different motherboard there are differnt BIOS configuration. When system start press 'Delete' key or Ctrl+F2 to enter BIOS and go to peripheral configuration then do the following settings Parallel Port Mode Address <0x378> In other motherboards do the following steps. First find where parallel port option, then enable it, then set your address as above, you can use 0x278 but normally not used. Then select bidirectional mode if available, otherwise select any mode which do not contain ECP and EPP. Don't put these modes because they have different protocols. Better you select all the modes except ECP , EPP and ECP+EPP and try. Note: ? Set parallel port mode to any mode except ECP,EPP,ECP+EPP, mostly set to SPP ? In some branded PC's of IBM etc.. you won't be able to acess BIOS properly.So in that case you won't be able to use dataport for input. Use only status port for input. ? You should see the bios setting before you start parallel port interfacing. This is the most important step.