help: ti 84 pce password program

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CalcNoobie101
Advanced Newbie (Posts: 61)

help: ti 84 pce password program
22 Apr 2026 04:52:41 pm
Last edited by CalcNoobie101 on 22 Apr 2026 05:07:30 pm; edited 2 times in total

what is this in asm

.db sk0
.db sk0
.db sk0
.db sk0

Full code:

Code:

.nolist


   #include "ti84pce.inc"


   #define RED $F800


   #define NAVY $0010


   #macro bcall(x)


      call x


   #endmacro


#define MBASE_OFFSET $D00000


.list


   .org userMem-2


   .db tExtTok,tAsm84CeCmp





PasswordStart:


   bcall(_EnableAPD)


   ld a,1


   ld (apdTimer),a


   ld (apdSubTimer),a


   set apdRunning,(iy+apdFlags)


   bcall(_ClrScrnFull)


   bcall(_HomeUp)


   ld hl,PressText


   bcall(_PutS)


   bcall(_NewLine)


   bcall(_NewLine)


   ld de,RED


   ld.sis (textBGcolor-MBASE_OFFSET), de


   set 4,(iy+PutMapFlags)


   bcall(_PutS)


   res 4,(iy+PutMapFlags)


   bcall(_NewLine)


   bcall(_PutS)


   ld bc,$03


   ld (penCol),bc


   ld a,$50


   ld (penRow),a


   ld bc,NAVY


   ld.sis (drawFGColor-MBASE_OFFSET),bc


   bcall(_vPutS)


   ld bc,$400


   ld hl,Password


KeyPress:


   call GetKey


   cp (hl)


   inc hl


   jr z,Asterisk


   inc c


Asterisk:


   ld a,'*'


   bcall(_PutC)


   djnz KeyPress


   dec c


   inc c


   jr nz,WrongPassword


   bcall(_ClrScrnFull)


   res onInterrupt, (iy + onFlags)


   ret


WrongPassword:


   ld hl,WrongPasswordMsg


   bcall(_NewLine)


   bcall(_PutS)


   bcall(_NewLine)


   bcall(_PutS)


   call GetKey


   jp PasswordStart





GetKey:


   push hl


   bcall(_GetCSC)


   pop hl


   or a


   jr z,GetKey


   ret





PressText:


   .db "This calculator belongs to****** ***********.",0


   .db "(***) ***-****",0


   .db "Password: ",0


   .db "******.***********@*******.com",0


WrongPasswordMsg:


   .db "Wrong password!",0


   .db "Press a key to turn off   the calculator.",0





Password:


   .db sk0


   .db sk0


   .db sk0


   .db sk0

ti_kid
Advanced Member (Posts: 229)

22 Apr 2026 04:53:33 pm

I mean I and others know what it means but we will need context to explain.

ti_kid
Advanced Member (Posts: 229)

22 Apr 2026 04:59:51 pm

I know ur a (ti)basic person so here's how I'll explain it.
So lets say you know there is a password 4 digits long and you cant use input, only getkey.
So you have 2 lists, 1 for input and 1 for the password.
Now you could have the actuall numbers of the password in the password list but then for input you have to convert the input to its number, store it, and check at the end. If you just store the keypress numbers in the password list instead, you save time by not having to convert the input first then storing it, you can just store it and compare at the end.

CalcNoobie101
Advanced Newbie (Posts: 61)

22 Apr 2026 05:03:47 pm

the code came from here: buh and I have absolutely no clue what you are saying, sorry.

commandz
2
Cemetech Admin (Posts: 1201)

22 Apr 2026 06:30:10 pm

.db is an assembler directive, which means that it's not a "real" instruction that the processor can execute but is telling the assembler what to do. "db" is short for "define byte", and it causes the assembler to output a single byte into the output program based on its argument. Day 2 of 83pa28d has a bit more information.

In this case the argument is sk0, which is a define from the ti84pce.inc include file whose value is the scan key code for the 0 key. There are also corresponding defines sk1 through sk9, as well as for other keys on the keyboard (e.g. skPrgm for the prgm key).

These bytes store the password that what the user enters will be compared to, so the password in this case is "0000". You can change the password by changing which defines each .db directive uses.

Lord Funion
Newbie (Posts: 13)

05 Aug 2026 08:08:09 am

I wrote a password tool in C++, so you could read its code. https://github.com/Lord-Funion/CE-Menu-Locker.

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