What is a Run Indicator? Funny you should ask... The Run Indicator is the marker in the upper right corner of the calclulator's display that comes up when the calculator's CPU is busy doing something. Sort of like the light that flashes when your computer's busy. This tutorial will show you how to turn the Run Indicator on and off.
Let's take the Getkey program that displays the keycode of a key press program (Tutorial 8). When the program is waiting for a key press, it displays a Run Indicator in the corner of the screen. Isn't that thing annoying? Simple solution is to get rid of it.
#define B_CALL(xxxx) rst 28h \ .dw xxxx #define B_JUMP(xxxx) call 50h \ .dw xxxx _clrlcdfull =4540h ;The ususal constants and defines, look at the ;New Commands section for more information _homeup =4558h _puts =450Ah _putc =4504h _getkey =4972h _newline =452Eh _RunIndicOff =4570h .org 9D95h B_CALL(_clrlcdfull) ; clear screen B_CALL(_homeup) ; home the cursor B_CALL(_RunIndicOff) ; Turning off the Run Indicator ld hl,txt1 ; Display the message at the txt1 label B_CALL(_puts) B_CALL(_getkey) ; Detect key press push af ; Save key press in register a B_CALL(_clrlcdfull) ; clear screen again B_CALL(_homeup) ; home again ld hl,txt2 ; Display msg2 B_CALL(_puts) ; Display text pop af ; restore reg a call dishex ; Follow commands at label dishex to find hex key code B_CALL(_getkey) ; pause until next key press B_CALL(_newline) ; Move cursor to next line ret ;Return to TI-OS dishex: push af ; keep copy of value and 0F0h ; terminate lower nibble rra ; shift nibble right 4 rra rra rra ld l,a ; Display the Key's hex code in Str1 ld h,0 ld de,hexStr push de ; keep for other nibbler add hl,de ; add offset to hexStr address ld a,(hl) ; find correct ASCII character from string below to ; display hex code of key pressed. B_CALL(_putc) ; display character pop de pop af and 0Fh ; wipeout upper nibble ld l,a ld h,0 add hl,de ld a,(hl) B_CALL(_putc) B_CALL(clrlcdfull) ret ; Return to OS hexStr .db "0123456789ABCDEF" ;These are the characters used to display the ;key's hex code txt1 .db "Push a key.",0 txt2 .db "Key code: ",0 .end END
_RunIndicOff - Disables the Run Indicator
There is a ROM call that does exactly the opposite of the _RunIndicOff call, it is _RunIndicOn ( RunIndicOn = 456Dh). To use it, place it at the end of a program to turn the Indicator back on, or put in in the front of the program to make sure it is on.Tutorial 11