HP 65 Question?

[PANAMATIK]

(04-02-2017 07:20 AM)AndiGer Wrote:  Running the HP-65 from the ac line with the battery pack removed may result in damage to the calculator.
On the other hand some lines higher you can find:
Since you cannot operate the card reader/writer without a charged battery, even with the charger plugged in, the battery should not be removed while running from the ac line.

From technical point of view, the card reader only draws more current than the charger can provide. Only charged batteries can provide enough current for driving the motor. The warning does not point to a potential damage of the calculator without batteries, but just that it will not be able to read write cards.

Same is for printing devices 10/19C/97, they cannot print without charged batteries.

Only the minor design of the HP-21/22/25/25C/27/29C power supply is really dangerous for the calculator chips, if used without batteries.

Bernhard