Difference between revisions of "83Plus:BCALLs:50B3"

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[[Category:83Plus:BCALLs:By Name|Chk_Batt_Low]][[Category:83Plus:BCALLs:By Name:Utility|Chk_Batt_Low]][[Category:83Plus:BCALLs:By Address|50B3 - Chk_Batt_Low]][[Category:83Plus:BCALLs:By Address|50B6 - Chk_Batt_Low]]
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[[Category:83Plus:BCALLs:By Name|Chk_Batt_Low]][[Category:83Plus:BCALLs:By Name:Utility|Chk_Batt_Low]][[Category:83Plus:BCALLs:By Address|50B3 - Chk_Batt_Low]]
 
== Synopsis ==
 
== Synopsis ==
 
'''Official Name:''' Chk_Batt_Low
 
'''Official Name:''' Chk_Batt_Low

Revision as of 02:52, 13 May 2005

Synopsis

Official Name: Chk_Batt_Low

BCALL Address: 50B3,50B6

Check the batteries.

Inputs

  • None

Outputs

  • Z=1: Batteries are low
  • Z=0: Batteries are good

Registers Destroyed

  • All

Comments

This is not just checking bit 0 of port 2. It puts the calculator into a special mode, creates a delay, polls bit 0 of port 2, and puts the calculator back to normal.

Example

B_CALL Chk_Batt_Low
ret z
B_CALL ChkFindSym
ret c
ld a,b
or a
ret nz
AppOnErr errHand
B_CALL Arc_Unarc
AppOffErr
errHand:
ret