Omnimaga

Calculator Community => Other Calc-Related Projects and Ideas => TI-Nspire => Topic started by: tangrs on December 18, 2014, 03:01:04 am

Title: [Help needed!] Looking for some hardware
Post by: tangrs on December 18, 2014, 03:01:04 am

Hi everyone!

I am looking for some hardware so I can do some reverse engineering. I am wondering if the members of Omnimaga could help me out.

As you know, I am developing serial breakout boards (https://www.omnimaga.org/ti-nspire-projects/ti-nspire-usb-serial-breakout-boards) and one of the requests I got was to add a USB host plug header. Unfortunately, it doesn't seem like it's straightforward to implement and I'll need to do a little hardware reverse engineering to ascertain some component values.

In other words, I'm looking to borrow a lab cradle if anyone has one that they can lend me for a bit so I can figure all this stuff out.

The second piece of hardware I'm looking for is a broken TI-Nspire classic calculator/motherboard.

I am looking to finally work out the mystery of the NAND controller on classic TI-Nspire (i.e. clickpad and touchpads/non-cx) motherboards. I was hoping to find some test points where I can attach a logic analyser and compare the output with the commands I am sending to the controller. Unfortunately the NAND chip is BGA package which means I can't get under the chip to see where the traces lead to. I'll need a sacrificial motherboard where I can desolder and potentially rip the chip off the motherboard to see where the traces run to.

It does seem like a shame to ruin a perfectly good calculator for this purpose. If anyone has a broken classic TI-Nspire or the half of the motherboard with the NAND chip on it (marked with NAND256 (http://www.datamath.org/Graphing/Images/TI-Nspire_Memory.jpg)), I'd really love it if you could send it over for me.

In both cases, I'd be happy to pay for postage if you would be kind enough to send it to me.

Thanks in advance guys!

Title: Re: [Help needed!] Looking for some hardware
Post by: Jim Bauwens on December 20, 2014, 12:31:31 pm

Ah, I only have a broken TI-Nspire CAS+ and they have NOR chips, so I suppose that won't do.

Xavier might be able to help you out with the Lab cradle.

Title: Re: [Help needed!] Looking for some hardware
Post by: Hooloovoo on December 20, 2014, 12:38:09 pm

I suggest that if you are looking for how to use the USB pins, you could also use one of the CX docks which have USB hubs in them. Unfortunately I have neither that nor a lab cradle nor a broken calc,

Title: Re: [Help needed!] Looking for some hardware
Post by: khalaan on December 22, 2014, 11:09:56 pm

I have a wlan cradle (dock connector)