HP-71B slower with HP-IL



#7

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 ?


#8

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.


#9

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.

#10

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.


#11

Garth, there might be a "DISPLAY IS" command still active. "OFF IO" should take care of this.


#12

or DISPLAY IS *


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