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Author Topic: Undocumented LCD feature - Flip screen  (Read 24068 times)

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Offline calcdude84se

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Re: Undocumented LCD feature - Flip screen
« Reply #45 on: July 21, 2010, 01:53:44 pm »
Indeed. The reason it probably isn't automatically fixed is that it produces different results over different LCD drivers, and some of the results were apparently bad.
But if it works, then yes :P
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Offline ztrumpet

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Re: Undocumented LCD feature - Flip screen
« Reply #46 on: July 21, 2010, 01:55:49 pm »
What if we emailed TI about this?  How would they tell us to fix a flipped screen? ;D
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Offline calcdude84se

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Re: Undocumented LCD feature - Flip screen
« Reply #47 on: July 21, 2010, 01:57:09 pm »
Probably the typical "Reset the RAM, if that does nothing, pull a battery"
We can't even be sure they're aware of it. ;D
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Offline ztrumpet

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Re: Undocumented LCD feature - Flip screen
« Reply #48 on: July 21, 2010, 01:58:50 pm »
Quote from: calcdude84se on July 21, 2010, 01:57:09 pm
Probably the typical "Reset the RAM, if that does nothing, pull a battery"
But that doesn't work.  I think I'd do an OS resend if I didn't know how to fix it, but that may not even fix it. :D
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Re: Undocumented LCD feature - Flip screen
« Reply #49 on: July 21, 2010, 01:59:35 pm »
ztrumpet, I think the most probable answer is to send them your calculator. Or the usual endless "I don't know, lemme send you to another department".
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Offline calcdude84se

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Re: Undocumented LCD feature - Flip screen
« Reply #50 on: July 21, 2010, 02:00:12 pm »
I'm pretty sure pulling a battery works. Did you only try a RAM reset?
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Offline ztrumpet

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Re: Undocumented LCD feature - Flip screen
« Reply #51 on: July 21, 2010, 02:00:42 pm »
Quote from: calcdude84se on July 21, 2010, 02:00:12 pm
I'm pretty sure pulling a battery works. Did you only try a RAM reset?
I only tried a RAM reset (2nd + 7 1 2).

Edit: Aww, pulling a battery works. :(
« Last Edit: July 21, 2010, 02:01:54 pm by ztrumpet »
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Offline calcdude84se

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Re: Undocumented LCD feature - Flip screen
« Reply #52 on: July 21, 2010, 02:06:01 pm »
Yeah, it kinda has to, since losing all power will reset things to a default state unless they're saved (and I doubt TI would invest in hardware with non-volatile RAM :P) and the normal orientation is the default, obviously ;D
But it's still amusing, since most people think resetting the RAM fixes everything. But I'd think even receiving an OS wouldn't fix it, because you don't need to pull a battery to do that. So you can definitely confuse people. :P
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Offline thepenguin77

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Re: Undocumented LCD feature - Flip screen
« Reply #53 on: July 21, 2010, 03:04:39 pm »
I don't think the battery pull itself is what does it though. You'll notice that when you pull a battery, when the screen turns back on, it was displaying the same thing it did before it turned off. This would mean the the lcd ram didn't get cleared. It would probably also mean that it's settings didn't get cleared either. That is probably the job of the OS to clear.

I couldn't find the spot in the OS where it happens, but I found it in the boot code. The boot code sends: 40h, 05h, 01h, 03h, 17h, 0Bh, and 0EFh. This makes me think that these aren't defaults. (13h-17h are undefined, but 13h-16h raise my contrast)

Also, not many people realize this because no one does it, but if you pull out the little battery as well as the AAA's. When you turn the calculator back on, the screen displays a bunch of garbage. Which makes me think that this is the only time that the lcd ram loses power. Maybe it will reset the screen flip settings too.

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Offline calcdude84se

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Re: Undocumented LCD feature - Flip screen
« Reply #54 on: July 21, 2010, 03:12:19 pm »
Interesting. Now that I think about, I noticed this when I opened it up and put the board in contact with the batteries...
Yeah, it makes sense that the boot code does it. There are probably different revisions of the boot code with the same version number.
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Offline ztrumpet

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Re: Undocumented LCD feature - Flip screen
« Reply #55 on: July 21, 2010, 03:13:39 pm »
Quote from: calcdude84se on July 21, 2010, 03:12:19 pm
Interesting. Now that I think about, I noticed this when I opened it up and put the board in contact with the batteries...
Yeah, it makes sense that the boot code does it. There are probably different revisions of the boot code with the same version number.
Most definitely.  The only problem is figuring out which is which. :)
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Offline meishe91

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Re: Undocumented LCD feature - Flip screen
« Reply #56 on: July 21, 2010, 04:07:49 pm »
You can also fix the orientation by typing in 0C, or at least that fixed the orientation for me.
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Offline calcdude84se

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Re: Undocumented LCD feature - Flip screen
« Reply #57 on: July 21, 2010, 04:12:46 pm »
We were already aware of that, we're just trying now to see what the boot code does about it. :P
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Offline Builderboy

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Re: Undocumented LCD feature - Flip screen
« Reply #58 on: July 21, 2010, 04:15:10 pm »
I wish mine could flip the screen :[ Maybe my sisters does....   >:D
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Offline meishe91

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Re: Undocumented LCD feature - Flip screen
« Reply #59 on: July 21, 2010, 04:27:45 pm »
Ah ok, just reading it sounded like you guys didn't know (which kinda shocked me :P). But I gotcha.
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