3 Replies Latest reply on Dec 24, 2011 7:45 AM by Flying_Kiwi

    D525MW LPT EPP-mode




      I am running D525MW with bios version MWPNT.ION.86A.0083.2011.0524.1600 and I can't get my LPT-port running in EPP mode.

      There is select-list in BIOS where EPP is selected but I am not able to clear EPP-timeout flag and operate in EPP-mode. Moreover, I request W83627DHG (which is super-io controller on the board) for CRF0 register of the first(LPT) logical device. This is always 0x02 which indicates that the port is in ECP mode instead of BIOS settings. When I write 0x01 into that control register I am able to operate in EPP-mode.


      What is wrong with the BIOS settings?


      p.s. When LPT-port is operating in ECP-mode, switching to EPP by passing 4 << 5 to base + 0x402 register (ECP control) has also no effect.

        • 1. Re: D525MW LPT EPP-mode

          Is there any reason why you can't try the latest version 0098 BIOS for this board?


          Even if that doesn't solve your problem, Is there any compelling reason why the parallel port needs to be in EPP mode on this PC (rather than ECP mode)? My understanding is that ECP offers better performance anyway. Sorry I can't contribute at the deep level you've raised as it's over my head/beyond my understading on the topic but I think trying the latest version of the boards BIOS would be a good start towards possibly getting what you want.

          • 2. Re: D525MW LPT EPP-mode

            I didn't find mention of that this problem was fixed in BIOS changelog so I decided that there is a simpler solution.


            My specific hardware doesn't support anything except EPP.

            • 3. Re: D525MW LPT EPP-mode

              Just because it's not in the change log, this does not mean that changes haven't occurred in this field (either deliberately or as a side effect of other changes). If you have a nosey at page 20, Section 1.7 of the Tech Specs for this board you will find that ECP (as well as EPP) is supported by the motherboard. What specific hardware do you have that doesn't support this (as sometimes new drivers will incorporate additional support) and have you tried configuring the board for ECP support and seeing how it goes.


              If it was my PC and a fully functioning printer port was my desired outcome, I'd be flashing that BIOS in a flash. For someone who's talking about port functioning at the depth you are, flashing an updated BIOS version (especially using the 'Express' method if you use Windows) would be comparatively very simple so your preference to leave the BIOS as-is surprises me.