Texas Instruments TI-83 Plus Manual page 79

Chapter 2: TI-83 Plus Specific Information
For example, use the GetKey routine to input only keys A-Z until either Í or É
is pressed.
Enter_Alphas:
keyLoop:
;
;
;
;
;
Return:
TI-83 Plus Developer Guide
B_CALL RunIndicOff
RES indicOnly,(IY+indicFlags)
B_CALL DisableApd
RES onInterrupt,(IY+onFlags)
EI
B_CALL GetKey
RES onInterrupt,(IY+onFlags)
OR A
JR Z,Return
CP kEnter
JR Z,Return
CP kCapZ+1
JR NC,keyLoop
CP kCapA
CALL NC,StoreKey
JR keyLoop
B_CALL EnableApd
RET
; no run indicator
; make key reads are
; done
; no auto power down
; clear on pressed
; wait for a key
; clear on pressed
; on key ?
; yes return
; jump if Enter key
; possible A-Z
; no ignore
; store it if A-Z
; look for more
; auto power down is
; enabled
Third Release May 28, 2002
69