HP Forum Archive 20

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HP-71B slower with HP-IL Message #1 Posted by scalpa49 on 7 Apr 2011, 5:28 a.m. I've found that my HP-71b is much slower with hp-il 82401 plugged in (with no cables attached). It take more than 4 seconds to compute a square root ! When HP-IL is unplugged, the speed is back to normal. Is it the normal behavior ?

Re: HP-71B slower with HP-IL Message #2 Posted by Eric Smith on 7 Apr 2011, 5:32 a.m., in response to message #1 by scalpa49 Yes. The HP-71B is trying to communicate on the HP-IL loop, and failing due to the lack of a loop. If you're not using any HP-IL devices, either connect a cable directly between the two ports, or give an "OFF IO" command. If you use "OFF IO", to reenable I/O you use the "RESTORE IO" command. It always seemed to me that it should be "ON IO", but that doesn't work.

Re: HP-71B slower with HP-IL Message #3 Posted by scalpa49 on 7 Apr 2011, 5:45 a.m., in response to message #2 by Eric Smith Thank you for your quick answer. This machine is rather new for me but i find the community very pleasant. As i have no cable (yet), i'll be using OFF IO/RESTORE IO commands.

Re: HP-71B slower with HP-IL Message #4 Posted by Garth Wilson on 7 Apr 2011, 2:42 p.m., in response to message #1 by scalpa49 Isn't the long time just to turn on, and it's fast after that? Mine always takes a couple of seconds upon turn-on to check out the loop before the time-out makes it conclude that the loop is broken since otherwise everything would have resonded by then, but after that everything has always been fast, even with no cable. I never use OFF IO but just leave I/O on all the time. Edited: 7 Apr 2011, 2:44 p.m.

Re: HP-71B slower with HP-IL Message #5 Posted by Marcus von Cube, Germany on 7 Apr 2011, 5:59 p.m., in response to message #4 by Garth Wilson Garth, there might be a "DISPLAY IS" command still active. "OFF IO" should take care of this.

Re: HP-71B slower with HP-IL Message #6 Posted by Garth Wilson on 7 Apr 2011, 6:47 p.m., in response to message #5 by Marcus von Cube, Germany or DISPLAY IS *

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