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The TI Basic Editor - possible tricks/hacks?


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https://nivelleringslikaren.eu/ti994a_basic/index.html

 

The above URL takes us to an online app that lets us code in TI basic or XB , and save it out to a .BIN file ... 

 

If you delete the .BIN extension the file is treat the same as a program file / FIAD

 

My point being, I've noticed that we can program a mistake and save it , and it's there in the program - it has bypassed the parser that would normally pick us up before we could save the program.

I've done this accidentally a few years ago and it produced a very artistic colourful crash.

 

So we COULD try to perform special hacks .... any clever / advanced programmers here that could possibly take advantage of this? 

 

 

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Above is the code I put into the Basic Editor, I pressed "download" and it saved it as a .bin but we can actually use this as a FIAD type program file, 

So watch what happens in my video when we put this into JS99er and attempt to run it - it gives us a strange result.

 

 

 

This code would normally NEVER be able to get past the BASIC parser in either TI BASIC or EXTENDED BASIC, also what is the significance of the strange result it gives us?

 

I doubt under normal circumstances anyone has seen a result such as that for the aforementioned reason.

Edited by Retrospect
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For one, you way exceeded the maximum quoted string length.  Obviously the translator did not catch that.  I would like to see what the binary looks like in the debugger.  My guess is, once it hit the length of the quote string, modulo 255, which looks like is 166 for your example, BASIC began interpreting the following Xes as tokens.  Working pretty much like a buffer overflow.

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8 minutes ago, OLD CS1 said:

you way exceeded the maximum quoted string length

Yes, quite deliberately.  I wanted to see what the TI would do with this when it has been forced upon it with no parser to interrupt us.  I'm thinking , because Senior Falcon once did something really clever with REM statements to produce some assembly in the stock console, someone could do something insane with the TI Editor?

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1 minute ago, Retrospect said:

Yes, quite deliberately.  I wanted to see what the TI would do with this when it has been forced upon it with no parser to interrupt us.  I'm thinking , because Senior Falcon once did something really clever with REM statements to produce some assembly in the stock console, someone could do something insane with the TI Editor?

Could be.  I never looked closely under the hood, so I cannot say whether it would allow any special non-printable characters to coincide with raw byte values for machine code.  Some neat tricks could be had.

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run this with RUN "DSK1.TEST2bin" .....(don't put the .  (dot) in )  it will do a crash but then will return you to the basic OS ... i was in extended basic.

 

The cursor is different, and text is different, graphics are messed up.  Type LIST and it gives and endless list of    02 " + over and over.  

 

What made it return to the basic after the crash is beyond me.  

 

The program is a long list of PRINT "HELLO WORLD! ";  without line numbers (again something that could never get past the parser.)

 

Maybe I'm just beating a brick in a dumb way or maybe I'm onto something here that could lead to something else with the right coders?

 

TEST2.bin

 

EDIT: Try this in TI Basic and it almost gives us a Commodore 64 loading screen with the flashing borders.  Nice

 

Edited by Retrospect
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2 hours ago, Retrospect said:

Yes, quite deliberately.  I wanted to see what the TI would do with this when it has been forced upon it with no parser to interrupt us.  I'm thinking , because Senior Falcon once did something really clever with REM statements to produce some assembly in the stock console, someone could do something insane with the TI Editor?

In XB or TI Basic in hex >FF (Decimal 255) is the max string variable length, but as it goes above you would be using the lower byte of a word value.

In other words hex >0100 (Decimal 256) would make that value 0 in decimal as the lower byte of a word is >00 in hex.

 

I have often thought of a RXB command making string any length called rope so you could use the Symbol ~ (tilde) that would allow a 2K single stirng.

 

 

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