This is how I understand it also. Some have 'fixed' this issue by adding pull up resistors on certain pins. If the port was set to EPP mode - this would not be needed.
(ie the g540 requires EPP mode for the charge pump to work) sam On 04/09/2012 06:25 PM, Peter C. Wallace wrote: > On Mon, 9 Apr 2012, Sebastian Kuzminsky wrote: > >> Date: Mon, 9 Apr 2012 17:01:41 -0600 >> From: Sebastian Kuzminsky<[email protected]> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <[email protected]> >> To: "Enhanced Machine Controller (EMC)"<[email protected]> >> Subject: Re: [Emc-users] Hal_parport and EPP >> >> EPP mode is a completely different way of using the pins of the parport than >> the regular SPP mode. In SPP, you have programmatic control over the values >> on the output pins, and you can read all the input pins. >> >> In EPP, those pins are driven by an additional piece of logic in the parport >> controller. The driver software asks the EPP controller to read and write >> addresses on the EPP bus, and the controller twiddles the pins to implement >> the software's request, according to the datalink protocol described by the >> EPP spec. So in order to do anything interesting/useful with the EPP port, >> you need a second driver that knows what registers to read and write on the >> device on the EPP bus. >> >> Simply switching the port to EPP mode doesn't accomplish anything. >> >> Maybe i'm missing something in your request? >> >> >> >> > > It does accomplish something subtle with some parallel port cards EPP mode is > compatible with SPP mode but on some parallel port cards it changes the drive > mode of some control output pins to Push-Pull instead of open drain with a > pullup. > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > ------------------------------------------------------------------------------ > For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Better than sec? Nothing is better than sec when it comes to monitoring Big Data applications. Try Boundary one-second resolution app monitoring today. Free. http://p.sf.net/sfu/Boundary-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
