@Cholsrea I'm not sure what you are trying to do. Are you trying to run a program on startup? zStart is a really awesome tool that lets you run programs on startup (among other things). The download has two different apps, one for the 84 and one for the 83 so make sure you install the right one. If that isn't what you are looking for, a lot more details would be helpful.

I believe zStart is only one app page. Since app sizes must be a multiple of 16384, it can't be any smaller. (If it is two pages, ignore that) I have used it extensively on the 84+ and not had any issues. What part is crashing?

I get that you are on a 83+ and flash space is tight but you pretty much have to use an App (and pay the full 16k for it) or do it the hard way in asm. Here is the WikiTi page that covers Onscript/Offscript. Note that the code for them is limited to 255 bytes and needs to have its origin at appData+1. That means you can't use Axe since it doesn't let you change the origin from 0x9D95. (Very basic Axe programs would work as long as the compiler doesn't use any position dependent instructions) You will also need to restore the appvar every RAM clear (which zStart does by modifying the OS itself).

There are other features in the OS. If you tell me what your goal is, I may be able to suggest some other feature to do what you are trying to do.

Warning: Asm can and will crash your calc and reset your ram. Archive anything you care about and ideally back up everything to your PC.

I can't exactly picture how your system works but I'll take that Str0 stuff and run with it. Would deleting Str0 on Offscript work? The assembly for that is very simple. I haven't tested this but it *should* work. It has been a long time since I have messed with TI-Basic strings so I might have messed up the name. Also this won't work if Str0 is archived.
;Put the (binary) contents of this in appvOFFSCRPT
.org $8001
    ld  hl, name
    RST rMov9ToOP1
    B_CALL ChkFindSym
    ret c
    B_CALL DelVar
    ret

name:
    db StrngObj, tVarStrng, tStr0, 0, 0


You would use a compiler like spasm-ng to compile the asm code. You can put asm code anywhere as long as it is set up correctly to run. To sidestep the problem, can't you just have a prompt on exiting the program that asks the user if they want to log off? I don't remember exactly how to mess with TI-Basic strings. I think they work just like programs. I usually use Axe for stuff like that so I will have to look up how to do it in asm.

@Cholsrea
This time I actually did my homework.
I tried modifying Str0 and got it to work as a program but couldn't get it to work as offscript.
So how about deleting a letter variable? Those can be read when deleted. You could set the variable to a special value to mean the login was still valid and if it is 0 then discard it.
I actually tested this and it works for me. You need to run the program SETIY in order for offscript to work. (It is safe to run it multple times) If you have a way to run asm in Basic, you could run FDCB33CE instead.

;offscript.asm
;compile with ./spasm -I inc -T offscript.asm OFFSCRPT.8xv
;or spasm.exe -I inc -T offscript.asm OFFSCRPT.8xv if you are on windows
;This deletes the letter variable 'A' but all you have to do is change the letter below and compile if you want a different one
#include "ti83plus.inc"

.org $8001
ld hl, name
RST rMov9ToOP1
B_CALL _ChkFindSym
ret c
B_CALL _DelVar
ret

name:
.db RealObj, 'A', 0, 0 ;you can change 'A' to any other letter you want (make sure it is uppercase) to delete that letter instead
.db 0

;set_iy.asm
;compile with ./spasm -T set_iy.asm SETIY.8xv //You are free to rename this program to whatever you want either here or on calc
;or spasm.exe -I inc -T set_iy.asm SETIY.8xv if you are on windows
;All this does is set a single bit to true. If that bit is false, the OS won't run offscript even if it exists
.db $BB, $6D
set 1, (iy+33h) ;sets bit 1 of iy+33h to indicate that there is an offscript installed


but isn't that already compiled?

Yes, the programs I attached are compiled and ready to use.

if so than how can i change A to W and recompile it, ect

To change A to W, see the second to last line in the offscript.asm from my last post.
There are two seperate programs, offscript.asm and set_iy.asm. You just make the files like a normal text document on your pc and paste in the code for each. My commands assume you created the files in the same directiry as spasm.exe. Then open command prompt in that directory and run the commands to compile each one. The compiled programs will appear in the same folder as the source code. I attached an changed version of offscript that deletes W instead.

also it seems your commands for spasm are different than the commands listed by spasm, is there multiple versions of spasm?

I don't know what you mean by different commands. I used this to compile the programs. I used a fresh download so I am sure that the binaries there work. I did use the linux version so your use for windows may vary slightly. Your spasm installation should have a 'inc' folder where ti83plus.inc is. (it comes with that - but checking for it is a good way to know you have the right folder).

but uhh, your assembly code causes an immediate crash, unless it requires the offscript to be there i think theres a mistake in it

SETIY did? I did test using a ti84 emulator but I can't imagine why it crashed. It doesn't require offscript and should always be safe to use. (Of course if offscript is buggy, you might crash when you turn your calc off but running SETIY on its own should never crash) Offscript won't work if it is archived but I don't think that is what you are doing.

not gonna lie, i have just been fighting trying to get spasm to work. building it doesn't work, and the prebuilts aren't working either.

like does it no work on windows anymore? I don't get it. its outdated and not updating throws errors, and updating it throws errors

It's hard to help you without knowing what errors you are encountering. It should still work on windows, as nobody has opened an issue about it not working since the last update to it 3 years ago.