On Tuesday 29 April 2008, Andrew Ayre wrote: >Wow - 8255s - I didn't know those were still used for commercial products. > Small correction, 82C55's, the cmos versions, so the board doesn't draw much more power than is consumed by any outputs being pulled high. Each line is limited to about a 2 mill load, but can pull rail to rail both directions. I had some of them once, sent them someplace that was gonna write a linux driver. I tried to write one myself, and found I knew very little about 'PC' architecture. The card contains no bios AFAIK, so its invisible to an lspci listing.
Once a linux driver is available, I think they would make a very nice interface for emc's use. With all 24 lines available on each chip, the i/o expansion possibilities sure beat the usual parport, an architecture originally built from the 8255 decades ago. IIRC the actual cabling from each chip was on a 34 pin floppy drive sized cable, so each card gave you 3, 34 pin ribbon cables out of a spare slot opening in the back of the case. One thing I ran into was that while that web site below shows prices in USD, they billed my card in AUD and applied the exchange rate, so I paid about a 20% premium over the quoted price. Quite close to a big buck each at the time, which was about 4, maybe 5 years ago now. I also bought a few of stepper controllers based on the L298 they have, touch them only with a very long pole, there is no current chopper available for current regulation. >Andy > >Dave Keeton wrote: >> This board looks good! I did just buy a new NI DIO 96 board off of EBAY >> for 50 bucks....If it does'nt work out I'll check it out. I guess i was >> completely wrong about the I/O situation. You all have been a big >> help....How do I go about setting up the drivers for these boards in EMC? >> I am not all that familiar with Linux.... >> >> Dave >> >> ----- Original Message ----- >> From: "Thomas J Powderly" <[EMAIL PROTECTED]> >> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >> Sent: Tuesday, April 29, 2008 12:39 PM >> Subject: Re: [Emc-users] Classicladder >> >>> to Dave Keeton: >>> http://www.futurlec.com/PCI8255.shtml >>> 79$ US >>> 72 i/o points >>> pci >>> emc2 driver is available, "sorta beta" >>> regards >>> TomP >>> >>> >>> >>> ------------------------------------------------------------------------- >>> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >>> Don't miss this year's exciting event. There's still time to save $100. >>> Use priority code J8TL2D2. >>> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/ja >>>vaone _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> ------------------------------------------------------------------------- >> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >> Don't miss this year's exciting event. There's still time to save $100. >> Use priority code J8TL2D2. >> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/jav >>aone _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users -- 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) Never have children, only grandchildren. -- Gore Vidal ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
