Unofficial Name: Chk_Batt_Level
BCALL Address: 5221
Check the batteries and returns their state in A.
- A: Battery level from 0-4 (0 being lowest, 4 being freshest)
This entry point puts the calculator into a special mode, polls bit 0 of port 2 several times, then puts the calculator back to normal.
This BCALL only exists on OS 2.30 and above.