On Wed, 26 Jan 2011, gene heskett wrote: > Date: Wed, 26 Jan 2011 21:45:04 -0500 > From: gene heskett <ghesk...@wdtv.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Second (PCI) parallel port card > > On Wednesday, January 26, 2011 09:27:46 pm Peter C. Wallace did opine: > >> On Wed, 26 Jan 2011, gene heskett wrote: >>>> The NetMOS/MOSChip chipsets are known _not_ to support EPP mode >>>> properly so will not work with Mesa/Pico/Pluto FPGA cards. They will >>>> work fine if you just want more I/O however. >>> >>> Thanks Peter. Now, to remember that when I do want to use it, that is >>> the problem. >>> >>> What specifically fails? >> >> http://www.mail-archive.com/emc-users@lists.sourceforge.net/msg11230.htm >> l > > This reads amazingly similar to a problem I had with an eprom burner I made > while at a radio station in NE CA in about '81 or '82, with about $25 worth > of parts, where the chip running the show was a Zilog Z-80. I was not able > to get a reliable write through my buffers and at the lines of the eprom > socket in time to get a good latch even with FAST parts, so I gave up and > called Zilog. Their response was that they thought ever one knew that when > the bus cycle started, if /READ wasn't true, then it was going to be a > write and that I should enable the buffers at the start of the cycle > anytime /READ was high. That gave me another 100ns or so to get every > thing in one sock and worked flawlessly. But there was no hint in the > published docs about such a prediction method. > > Now, whether such a similar work-around could be cobbled up for that, I > have no clue. > > Besides, the card I have does not have the 9805, but has the 9815, > presumably a newer chipset. > > I wonder it there could have been a fix for that applied in the newer 9815 > chip?
All the 98XX series parts share the problem. (the existance of the problem is documented in the MOSChip data sheet. Their suggestion is to not use EPP mode...) > > How would one go about checking that?, I assume with a loopback plugged in > it should be amenable to software checking. One would have to cobble up a > parallel loopback, I may have enough of those parts on hand. > > Thanks Peter. A loopback for EPP needs at least an inverter for the handshaking... > > -- > Cheers, Gene > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > <http://www.captaincanadacrusades.ca/articles/none-dare-call-it- > conspiracy%5B1%5D.pdf> > Today, THREE WINOS from DETROIT sold me a framed photo of TAB HUNTER > before his MAKEOVER! > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ 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
