I have used an interface from Softmark. I don't know if multiple interfaces can be applied, but they are USB. There's no local storage, everything is in the host, and I have not timed the use. OTH, they can be bought for about $40US on ebay or straight from the Aussies at softmark. Comes with dll's and an app... Don
Robert Darlington > You can *probably* replace the EEPROM with an FRAM chip (or even a free > sample of an FRAM chip) to get around the wear issues. I haven't opened > my > unit, but this is a serious issue as I'm gearing up to write software to > make a "poor man's" network analyzer using a frequency synthesizer and a > volt meter, switching between them pretty much as fast as possible. Maybe > I'll just use that NI card ;-) > > -Bob > > On Mon, Jul 6, 2009 at 11:07 AM, Samuel D. [x86/CPC] > <s...@canardpc.com>wrote: > >> Damn, that's a big flaw. >> >> The software I'm working on send three "++addr" commands per second. >> >> Only 4 days @24h/day to reach the limit :-/ >> >> >> -----Message d'origine----- >> De : time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] De >> la >> part de Mark Sims >> Envoyé : lundi 6 juillet 2009 18:54 >> À : time-nuts@febo.com >> Objet : [time-nuts] Prologix GPIB-USB vs. GPIB-LAN vs. NI was: AW: >> Prologix >> GPIB-USB vs. GPIB-LAN >> >> >> The Prologix adapter has a ++addr command for changing the GPIB address. >> You can select different instruments that way. >> >> Unfortunately, the version I looked seems to have a potentially fatal >> flaw. >> When you change the ++addr, the device writes the internal >> microprocessor >> EEPROM. The EEPROM is speced a 1 million write cycles. If you changed >> instruments at once a second, in under two weeks the chip could be >> toast. >> My app could have worn out the chip in under a day... >> >> All this assumes that Prologix did not implement some sort of elaborate >> wear >> leveling scheme in their software, but I suspect not. They seem to >> have >> intended one to set up the device to talk to one instrument then save >> that >> configuration in the chip. Dynamically hammering the thing to death >> with >> address changes was not the intention of the ++addr command. >> >> I wound up implementing a GPIB controller (with Prologix emulator) with >> my >> MegaDonkey touch screen LCD controller. It even included a HPGL/PCL >> plotter >> routine to draw instrument plots on the 160x80 LCD. >> >> ---------------------------------------- >> >> >> >> >> >> _________________________________________________________________ >> Windows Live SkyDrive: Get 25 GB of free online storage. >> http://windowslive.com/online/skydrive?ocid=TXT_TAGLM_WL_SD_25GB_062009 >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.