On Wed, 2011-09-14 at 18:51 +0100, [email protected] wrote: > Re EPP mode only being required for Mesa etc > > Thats a theory I have been told before, but I found that using pins > 2-9 for IO simply did not work unless the card was in EPP mode. > The pins were shown as created but when you tested the input signals, > nothing got through.
It just seems to me if EPP were enabled, the control and status pins would be taken over by firmware, but EPP send and receive are handled by separate in and out registers... oops, in checking: http://www.beyondlogic.org/epp/epp.htm it looks like SPP, PS/2, Bi-Dir type reads and writes should be compatible with EPP mode. Different chips sets may follow the "standard" rather loosely, so some cards may act differently. As far as general EMC2 parallel port I/O goes, I still think, for the majority of PCI cards, EPP mode will _not_ be required. EPP shouldn't hurt, and may help force the Base register into Bi-Dir mode for cards that need the extra help. On another hand, with SPP and pins 2-9 set to output, there are five input pins, and adding PCI cards is cheap. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ BlackBerry® DevCon Americas, Oct. 18-20, San Francisco, CA Learn about the latest advances in developing for the BlackBerry® mobile platform with sessions, labs & more. See new tools and technologies. Register for BlackBerry® DevCon today! http://p.sf.net/sfu/rim-devcon-copy1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
