Texas Instruments TI-83 Plus Manual page 110

100
Do some clean up and let the system report the error.
Modify the error code to remove the GoTo option and have the system report
the error with only a Quit option.
Example one:
Do not allow the error to be reported by the TI-83 Plus. Compute 1/X and return CA = 0
if no error, otherwise return CA = 1.
;
;
; If no error then returns from the call
;
;
; control comes here if X = 0 and generates an error
;
My_Err_handle:
Example two:
Allow the error to be reported by the TI-83 Plus, but remove the GoTo option.
Compute 1/X.
;
;
; If no error then returns from the call
;
;
; control comes here if X = 0 and generates an error, ACC = error code
;
My_Err_handle:
TI-83 Plus Developer Guide
AppOnErr My_Err_handle
B_CALL RclX
B_CALL FPRecip
AppOffErr
OR A
RET
SCF
RET
AppOnErr My_Err_handle
B_CALL RclX
B_CALL FPRecip
AppOffErr
RET
RES 7,A
B_JUMP JError
Chapter 2: TI-83 Plus Specific Information
; OP1 = (X)
; 1/OP1,
; remove the error handler
; CA = 0 for no error
; CA = 1 for error
; OP1 = (X)
; 1/OP1,
; remove the error handler
; bit 7 of error code controls GoTo
; option
; trip the error with no GoTo option
Third Release May 28, 2002