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Chapter 2: TI-83 Plus Specific Information 69

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

For example, use the GetKey routine to input only keys A-Z until either Í or É

is pressed.

Enter_Alphas:

B_CALL RunIndicOff ; no run indicator

RES indicOnly,(IY+indicFlags) ; make key reads are

; done

B_CALL DisableApd ; no auto power down

keyLoop:

RES onInterrupt,(IY+onFlags) ; clear on pressed

B_CALL GetKey ; wait for a key

;

RES onInterrupt,(IY+onFlags) ; clear on pressed

OR A ; on key ?

JR Z,Return ; yes return

;

CP kEnter

JR Z,Return ; jump if Enter key

;

CP kCapZ+1 ; possible A-Z

JR NC,keyLoop ; no ignore

;

CP kCapA

CALL NC,StoreKey ; store it if A-Z

JR keyLoop ; look for more

;

Return:

B_CALL EnableApd ; auto power down is

; enabled

RET

Texas Instruments TI-83-Plus User Manual

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