Bricked TI-Nspire CX (black screen)

→ **MyCalcs** profile · by **Python_Fan** » 31 Oct 2018, 13:53

So when it only looks like the calc doesn‘t turn on maybe the TTL Interface works. (But I have no idea how to use that

)

→ **MyCalcs** profile · by **critor** » 31 Oct 2018, 14:14

Maybe indeed; maybe the Boot2 partition is corrupt and you're in the Boot1.

You need to buy an USB/TTL interface (shouldn't be much more than 5€), and connect it like this :

The parameters then for the client software (HyperTerminal included in some Windows versions, Putty...) are then :

115200 baud
Data bits: 8
Parity: Even
Stop bits: 1
Flow control: None

→ **MyCalcs** profile · by **Python_Fan** » 31 Oct 2018, 17:03

Bougth this USB to TTL, but it’s a cable. No different, but only one question:
The cable has four colours: red, black, green and white. White and green are the TxD/RxD, but what if these is the “GND”?
On the package red is 5V DC and black is “mass”.
Can I use this cable on MacOS to? It would be easier than Windows

Thanks for your time!

→ **MyCalcs** profile · by **critor** » 31 Oct 2018, 17:09

The 5V is not required for the TI-Nspire.

Any picture ?

→ **MyCalcs** profile · by **Python_Fan** » 31 Oct 2018, 17:10

I can use 3.3 V too.

→ **MyCalcs** profile · by **critor** » 31 Oct 2018, 17:50

No need to connect the 5V or 3.3V for the TI-Nspire.

→ **MyCalcs** profile · by **Python_Fan** » 14 Nov 2018, 07:29

Hi,
at the moment I’m struggling with connecting the cable to the pins at the bottom, it’s hard.
Three questions: what’s to do after sending the stuff?
In PuTTY there is a text box with “COM1”, what enter there?

And i found this cable yesterday; im not sure but is it a TTL, because it fits into the slot on the top of the calc.

Thanks for your time

)

→ **MyCalcs** profile · by **critor** » 14 Nov 2018, 12:32

The TI-Nspire CX large top connector has never been documented so far, so I don't know what's possible to do with it.

About the COM port, check your computer device manager to see which COM port number does appear when you connect the USB/TTL interface.

→ **MyCalcs** profile · by **Python_Fan** » 14 Nov 2018, 20:18

What is supposed to happen after sending this data over the serial pins?
So I can see if I do it wrong ;

BTW, what’s to do for a factory reset or something similar, because I can’t use a CAS calculator in math tests

→ **MyCalcs** profile · by **critor** » 15 Nov 2018, 00:04

When you get the right COM port and connections, set putty to 115200 bauds.
The calculator should then be able to talk to putty.

Reset the calculator while holding

.
Then send the following file using the Xmodem protocol : archives_voir.php?id=481757