Re: HP-97 power supply Message #4 Posted by Andrés C. Rodríguez (Argentina) on 19 Oct 2001, 8:49 a.m., in response to message #3 by Viktor Toth
If I recall correctly, the card reader circuitry is more than enough cause to avoid operation from AC adapter without a battery pack in the HP 65, 67 and 97, at least.
Similar considerations against use with AC adapter and without a rechargeable battery pack apply to Woodstock and Spice series (HP 22, 25, 27, 25C, 29C, 31E, 32E, 33E, 33C, 34C, 38C); since the battery has a **critical** role as voltage regulator.
This is NOT to imply models not detailed here are safe to run from AC with batteries, it is always preferable to have a good battery pack and with clean contacts while using a AC adapter.
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