Difference between revisions of "83Plus:BCALLs:50B3"
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'''Official Name:''' Chk_Batt_Low | '''Official Name:''' Chk_Batt_Low | ||
| − | '''BCALL Address:''' 50B3 | + | '''BCALL Address:''' 50B3,50B6,80F0,80F3 |
Check the batteries. | Check the batteries. | ||
| Line 20: | Line 20: | ||
This is not just checking bit 0 of port 2. | 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. | It puts the calculator into a special mode, creates a delay, polls bit 0 of port 2, and puts the calculator back to normal. | ||
| + | BCALLing 50B6 is slightly different from 50B3 because a small delay is done before the routine. | ||
| + | BCALLs 80F0 and 80F3 are the boot page versions of these routines. | ||
== Example == | == Example == | ||
Latest revision as of 21:45, 5 November 2006
Synopsis
Official Name: Chk_Batt_Low
BCALL Address: 50B3,50B6,80F0,80F3
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. BCALLing 50B6 is slightly different from 50B3 because a small delay is done before the routine. BCALLs 80F0 and 80F3 are the boot page versions of these routines.
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
