On Friday 07 September 2012 10:43:43 Kent A. Reed did opine: > On 9/3/2012 4:51 PM, Michael Haberler wrote: > > well, that seems to work just fine - no major surprises > > > > here's as screenshot from a logic analyzer connected to an Intel D5252 > > parport, running the userland parport driver in sim mode > > > > http://static.mah.priv.at/public/uparport.png > > > > it's a 1kHz square; there are delays of up to 4ms in this trace. > > Logic analyzers, oscilloscopes---I know the drill but I no longer have > easy access to such instrumentation. > > Has anyone come up with simple (e.g., inexpensive) ways to measure > latencies in the range we are interested in - say a range of 1K - 100K > pulses per second with pulse widths on the order of microseconds. > > Back when the world was young and we wannabe researchers avidly read > from cover to cover in each new data-book from the likes of TI and > Motorola, I used to design and build comparable circuits, but then I had > the bench instrumentation to test my testers, so to speak. Now I'm in a > catch-22 situation. > > If I could turn back the clock, I'd probably use this problem as a > reason to explore FPGA, but instead I'm noodling about using a > Beaglebone or somesuch as a starter. > > Thoughts, anyone? > > Regards, > Kent
I froze that clock 20 some years ago. We'd hired a switcher who had taken a coarse in computers that involved the requirement for a 100mhz dual trace scope, one of Hitachi's earlier sorta digital models and one of the motorola M68k carrying motherboards. He needed some grocery money till he could get caught up out of the starving student situation and offered to sell it all to me. I was then freshly married and had just got caught up with the IRS after the ex-bitch had been caught fudging the returns & they came after me for about 7k$ on that go-round, so I paid him $200/wk for 6 weeks for what was then a $2400 scope brand new. But since the M68k board wasn't compatible with most amiga SW I passed on that. But when Dave or Mark called my attention to that teeny little DSO1 on ebay a few months back, a 4 mhz rechargable pocket scope about the size of a cell phone, I grabbed one of those because when its USB charging cable is unplugged, you can hang it anyplace in a circuit without worrying about crowbarring the 127 volt powerline. Sure, it has some foibles, mostly related to probe vs input circuit miss-matching, but I find myself using it where I don't need a dual trace, probably 90% of the time. I think it was about an $80 bill at the time? Ben Finney has some updated SW you can put in it, adds a few more functions. When you need it, handier that that famous button on the outhouse door. ;) It looks at the parport outputs to the steppers etc very nicely. > ------------------------------------------------------------------------ > ------ Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. > Discussions will include endpoint security, mobile security and the > latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > 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) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! I can't mate in captivity. -- Gloria Steinem, on why she has never married. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
