On Thu, Jan 27, 2011 at 11:15 AM, Jon Elson <el...@pico-systems.com> wrote:
> andy pugh wrote: > > On 26 January 2011 20:56, Igor Chudov <ichu...@gmail.com> wrote: > > > >> The bad news is that the parallel port chipset that is on my new PC's > >> motherboard, does not want to talk to PPMC when two encoder boards are > >> installed in PPMC. > >> > > > > Which motherboard? > > > > I assume that this is unrelated to the known problem with the Intel > > D510MO which has been worked-around here? > > > http://git.linuxcnc.org/gitweb?p=emc2.git;a=commit;h=c9c7ebfa472dcd1de02ccb6470340a97f15a588e > > > > > Yes, it appears unrelated. His PC motherboard works with ONE PPMC > encoder board, but fails with TWO of them. It has to be some strange > timing error. I have verified that two encoder boards work fine on the > D510MO (after making some fixes to older encoder boards and DAC > boards.) Every multi-IO chip has its own way of interpreting the > incredibly lax specs of the IEEE-1284 protocol. Some boards put the > data and WRITE/ signal out first, then provide the strobe pulse. Some > put them out at the same time, one I saw actually put out the data and > WRITE/ AFTER the strobe! Well, how much delay do you need to be sure > the data and WRITE/ are stable? Who knows!! So, all this keeps me > hopping whenever a new multi-IO chip comes out. > > > Jon, I bought two cards, a Lava one and a Startech that is NOT based on a NetMos chip. I will try both when I get them. Do you know if the fixes that you mention, also are needed for my encoder boards? i ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
