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Chapter 2: TI-83 Plus Specific Information 109

TI-83 Plus Developer Guide Third Release May 28, 2002

For example, parse the graph equation Y1 and store the answer in Y. Install an error

handler around the parsing and the storing routine to catch any errors. RET CA = 0 if

OK, else ret CA = 1.

LD HL,y1Name

RST rMov9ToOP1 ; OP1 = Y1 name

;

AppOnErr ErrorHan ; error handler installed

;

B_CALL ParseInp ; parse the equation

;

; returns if no error

;

B_CALL CkOP1Real ; check if RealObj

JR Z,storit ; if a RealObj, try to store to Y

;

AppOffErr ; remove the error handler

;

; come here if any error was detected

; error handler is removed when the error occurred

;

ErrorHan:

B_CALL CleanAll ; remove temps if any

SCF ; set CA flag to signal failure

RET

;

storit:

;

B_CALL StoY ; store to Y, ret if no error, else

; ErrorHan

;

AppOffErr ; remove error handler

;

B_CALL CleanAll ; remove temps if any

CP A ; CA = 0 for no error

RET

;

y1Name:

DB EquObj, tVarEqu, tY1, 0

Texas Instruments TI-83-Plus User Manual

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