The best way I see to test this is to plug headphones into your calculator. Make this program and run it with asm(.  This program makes a ~50Hz sound on both sides and has no way of quitting.

Code: [Select]

:AsmPrgm
:FBAFD30076EE031
8F9


real code (don't type this)
ei
xor a
loop:
out (00), a
halt
xor 3
jr loop

I tested it to work on mine and the sound will give you a headache, but it works.

Thanks for this.

I don't have a 3.5 to 2.5 mm adapter, but I'm going to make one tomorrow.

In the mean time, I tested the electricity from the link port using a volt meter (actually a multi-meter), and there was a spike in voltage when your program was running. Of course, I don't know if that means anything or not- would there still be increased voltage in the link port even if no sound was being produced?

Just today, I discovered that my calculator (my 83+; I also have a Titanium) can't link to my computer anymore.

I had cleared my calculator of most programs on it, save for a Basic program (hooked to Startup, to print my name and contact info to the screen), a BBC Basic program (didn't do much, I just wrote it to experiment with BBC Basic) and an Assembly game (Pong Z80, which was the last program I sent to my calculator).

Then, when I went to load some more games, I found that TI Connect couldn't pick up my calculator anymore, when I went to send additional games to my calculator. I assumed that the error was TI Connect's, and so I uninstalled and reinstalled it. That didn't fix the problem, so I then went to my Windows XP laptop- my desktop has Windows 7 64-bit- and tried the installation of TI Connect there. That didn't work, so I uninstalled TI Connect from my laptop and installed TiLP. But TiLP also didn't pick up my calculator. (It did pick up my Titanium, though, so I know I'm using it correctly).

At this point, I had the problen narrowed down to two things- my cable (a SilverLink) or my calculator itself. I can't test the calculator-to-calculator link, because I've lost my 83+ cable and in any event, I don't have X-Link installed (to communicate with my Titanium, but I could test the cable) by plugging it into my Titanium's serial port. TI Connect was able to pick up my Titanium using the SilverLink.

A search of the UTI, Cemetech, and Omnimaga tech support forums brought up this on Cemetech. Someone had a similar problem, and it turned out to be a hardware problem- the soldering on the link port failed. That could very well be possible, as my calculator is pretty old (hardware revision A, if I'm reading the serial number correctly). However, I'd like to be sure before I take my calculator apart and solder my link port: is it possible there's some software corruption instead? Could it be some part of the OS, or possibly even the certificate, is messed up? I've done RAM clears- both from the Memory menu on the calculator and by pulling out a battery- so I don't think it could be some part of RAM that's been corrupted.

I do have CalcSys installed if there's some test I can do using it. I also can run any assembly program by loading it into WabbitEmu, unprotecting it, and copying the program token by token into my 83+... not that I want to do that, but if there's some assembly program I could use to test, or fix things, I could run it.

Oh, and apart from the link port, the calculator is fine. I haven't noticed any other errors, which is why I think it might only be a hardware problem... I just want to be sure.

I think it should be every month.

Although, if it were every month, perhaps it could be a tier-based system? Maybe every month there would be a POTM, and then at the end of the year, the 12 POTMS (12 for each category, of course) would compete for the Omnimaga POTY?

Quote from: willrandship on July 01, 2010, 05:43:23 pm

I was thinking: if we used ndless, could we ever access the area of the memory to change the factor required? We could make our own rsa key and replace ti's (making a key takes like 3 seconds)

I really don't know much about this, but I don't think TI would make it that easy on us.  If that was the case, I would think that the same thing would have been done to get the keys for all of the other calcs.

Back before the keys were cracked, BrandonW released some programs for Z80 calcs (73 and 83+) that patch the certificate to allow this; one gets the 83+ to accept community-signed OSes, and one gets the 73 to accept community-signed apps.

http://www.ticalc.org/archives/files/fileinfo/420/42048.html
http://brandonw.net/calcstuff/free73.zip

And there's also a program called FlashAppy that does the same thing for 68k calcs, it gets them to accept community-signed flash apps.

http://www.ticalc.org/archives/files/fileinfo/413/41328.html

So it's probably not impossible for the Nspire.

Hi!

I first learned to program my old TI-83 Plus last year (in Basic), and since then I've become more interested in calculator programming, leading to me getting a TI-89 Titanium, fooling around with assembly for the 83+, and, by a sort-of direct path, joining this site (even though I discovered it two months ago).

I have some knowledge of Z80 assembly, but it's very sparse at the moment, as is my knowledge of C for the Titanium, something I started learning only recently.

I also can do computer programming, in Visual Basic .NET and in Python.