On Sunday 16 February 2020 12:36:16 Jon Elson wrote: > On 02/16/2020 01:26 AM, Gene Heskett wrote: > > Jon, are you saying that a 25 line ribbon cable doesn't work right > > omn a D-525-MW mobo? Or is there a length beyond which it not > > reliable? > > > > I ask because the only times I've had a cable problem, driving it > > with either of my D-525-MW's parports it really was a cable problem. > > A long ribbon cable will not work. The critical pins are 1 > (write/), 14 (DataStrobe/), 17 (AddrStrobe), > and 11 (Wait). These will be next to other signals on a > ribbon cable. Possibly a twisted-pair ribbon > would be slightly better. I have gotten away with a one > foot ribbon cable on my PPMC hardware, but > much longer than that and the crosstalk starts to cause errors. > > I have a diagnostic program, and one option is a write and > readback test that sends random data > to the encoder counters and reads it back as fast as it > can. My confidence test is if it can do > 100,000 cycles with zero errors, then all is good. (This > only takes 30 seconds or so.) > > Jon > Is this cable tester downloadable from the pico systems web site? > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
