pashdown@javelin.es.com (Pete Ashdown) (02/07/91)
egraeler@uceng.UC.EDU (Eric S Graeler) writes: >If you simultaneously hold down the ON key and the SPACE key and then release >them, the caluculator will beep, some random garbage will momentarily flash >on the screen and then it will be in an off state. When you turn it back on >you will breifly see what use to be on the stack and/or the menu you were in. >It will then go to a state though as if you had done a reset with ON-C. >Also when you do this, TIME STANDS STILL, that is when you turn it back on >and look at your clock it will be at about the same time where it was when you >did ON-SPACE. >The best I can figure is that this sends a signal to the micro-processor to >halt exection, stop all clocks, and turn off the display. >Has anyone else encountered this or does this work for anyone else? Yes, this was documented early on as the 'coma' mode. It throws the 48 into a state where it uses little or no battery power. This enables HP to package the batteries in the calculator, yet not have to worry about them being dead when a person turns it on for the first time. -- "Hi, we're 'Slaughter'. We'd just like to say how much we love our troops." Pete Ashdown pashdown@javelin.sim.es.com ...uunet!javelin.sim.es.com!pashdown
frechett@spot.Colorado.EDU (-=Runaway Daemon=-) (02/07/91)
In article <7413@uceng.UC.EDU> egraeler@uceng.UC.EDU (Eric S Graeler) writes:
[Re ON SPACE]
=+ The best I can figure is that this sends a signal to the micro-processor to
=+ halt exection, stop all clocks, and turn off the display.
=+
=+ Has anyone else encountered this or does this work for anyone else?
=+
=+ Eric Graeler
=+ egraeler@uceng.uc.edu
You have it exactly correct. This is called COMA mode and is documented in
Jim Donneley's handbook. I do not know if it is in the regular manual or not.
It it used, if you plan on turning off your calculator and leaving it off
for a LONG time and don't want to eat the batteries. Put it in COMA mode and
it shuts down the system clock entirely leaving nothing running. No alarms
will go off and there will be no activity at all. Very useful little feature.
ian
-=Runaway Daemon=-