Detecting presence of SD-card on HP-50g

[DavidM]

(07-15-2021 04:53 AM)cahlucas Wrote:  Another question: Why is it important to turn off the calculator before inserting or removing the SD card?

Two reasons here:

1) It's generally best to make sure that the card is seated properly in any device before power is applied to the card. There's always the chance that the act of inserting the card will apply power before all of the pads are making full contact, which may not allow the card to start up properly.

2) In this specific case, the 50g's operating system checks for the presence of the card and reads directory information from it during the power on sequence. This step needs to have already been completed before using this Saturn code object, so trying to use this code if the sd card has been changed without giving the O/S a chance to detect the change will give meaningless results.