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developers.md

@@ -2,18 +2,18 @@
 This page has information relating to developers and what they can and cannot use.
   
 ### Contents:
-System Varibles  
+System Variables  
 Modules  
 Built-In Calls and Labels  
 
-## System Varibles
+## System Variables
 NOS has a decent amount of system varibles and labels that cannot be overwritten. Below is a list of them and their location (what subprogram they are in) and whether or not they can be overwritten.  
   
 ### NOSSPRIT    
-No Varibles  
+No Variables  
   
 ### NOSHEAD  
-No Varibles  
+No Variables  
   
 ### NOSSRH  
 FILES - This has the program names and the data. This is in the format of a 17 byte set as seen below:  - DO NOT OVERWRITE -  
@@ -35,10 +35,10 @@ SIZE - Size of first program, this may be overwritten after the program is switc
 ARC - Archive status of the first program, this may be overwritten after the program is switched  
   
 ### NOSGUI  
-No varibles  
+No variables  
   
 ### NOSCTRL
-G - getKey varible, overwrite at your own risk  
+G - getKey variable, overwrite at your own risk  
 prgmTEMP - Temporary program for running ASM and BASIC programs  
 prgmASM - ASM program data for running  
 SLOT - Selected Program Slot, overwrite at your own risk  
@@ -53,7 +53,7 @@ L5 - Color / Settings Data, formated as below:
 LOC - Location of cursor on menu  
 
 ### NOSPROG  
-No Varibles  
+No Variables  
   
 ### NOSSUB  
 B, ICONX, ICONY, ICONCHAR, ICONCOLOR, SET, STATUS, POS - Temporary Varibles, may be overwritten  

hooks.asm

@@ -0,0 +1,62 @@
+.nolist
+#include "ti84plusce.inc"
+.list
+
+.org userMem
+.db $EF,$7B
+
+hook_addr = appBackupScreen
+
+start:
+ ld hl, hook_start
+ ld de, hook_addr
+ push de
+  ld bc, hook_end-hook_start
+  ldir
+ pop hl
+ ld a, 1
+ call _SetGetKeyHook
+ ret
+   
+hook_start:
+ .db $83
+ bit editOpen, (iy+editFlags)
+  ret z
+ cp kWindow    ;if y= wasn't pressed, check if we should uninstall hook
+  jr nz, disableHook
+ ld hl, hook_addr + varname - hook_start
+ call _Mov9toOP1
+ call _ChkFindSym
+  jr c, disableHook  ;if prgm doesn't exist
+ ld hl,$0055
+ ld (saveSScreen),hl
+ ld (OP1+1),hl
+ ld hl,saveSScreen+4
+ ex de,hl
+ ld c,(hl)
+ inc hl
+ ld b,(hl)
+ inc hl
+ ld (saveSScreen+2),bc
+ ldir
+ ld a,5
+ ld (OP1),a
+ call _ChkFindSym
+  jr c,$+5
+  call _DelVarArc
+ ld a,5
+ ld hl,saveSScreen
+ call _ExecuteNewPrgm
+ ld a, 0
+ ret
+
+disableHook:
+ cp kGraph
+  ret nz
+ call _ClrRawKeyHook
+; ld a, 0    ;pressing Graph continues to the graph screen
+ ret
+   
+varname:
+ .db ProgObj, "NOS", 0, 0
+hook_end: