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According to Randy, you can damage the card reader sensor by operating the calc off the ac adapter w/o a battery, regardless of whether you use the card reader. This is because the card reader circuit is powered directly off the battery charger side of the ac adapter, which outputs about 16 vdc no-load. Randy can provide more specific details on this. The same caveat applies to the HP-65.
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Michael is correct,
In fact here is a quote from the HP 91 manual and the HP 97 manual:
NOTE: OPERATING THE HP-91 (OR 97) FROM THE AC LINE WITH THE
BATTERY PACK REMOVED MAY RESULT IN WRONG OR IMPROPER DISPLAYS.
Although these are not as supseptable to the Woodstock power catastrophes, they were not designed to work without a FUNCTIONAL battery pack.
Cheers, geoff
added after the above posts:
as noted above, the hp 91 manual also does not mention damage, question is, should it have or was the statement in quotes above meant to discourage the use?
Edited: 21 Aug 2011, 3:54 a.m.
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Running an hp97 without the battery will destroy the printer if you try to print
