Well, I went back and did basically the same stuff I was doing yesterday, and in at least 20 minutes of fooling around, and almost continuous jogging from the cursor keys, it never blipped, even once. So, I don't know what to make of it. Is this just a very rare instance of keyboard up/down messages getting lost, and I just happened to to have a very strange run of these events?
I wanted to get some idea of the baseline frequency of these events before changing the keyboard, but I failed to get any meaningful data. Hmmm, a theory, based on nothing...... I haven't used this machine very much, I think I've only had it turned on a couple times since the EMC fest! (Rare to use it so little.) Maybe the crummy keyboard was just a bit dirty-oxidized-whatever inside, and I made enough key presses to clean it. (I'm guessing this is one of those elastomer sheet keyboards where the PCB is the switch contacts, and the sheet has little carbon-loaded bits to connect them.) If the contacts are dirty, you get poor contact resistance, and the scanning chip gets confused by capacitive noise. Or, I just didn't stay with it long enough to reveal the problem. It did seem like the problem disappeared after the first half of my machining session last night. So, maybe that was it, just a dirty keyboard contact! Those arrow keys got more use than any others on that KBD, and it has been used on the mill since 1999, because it has the fluid-proof cover. Jon ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
