[A83] Re: Here we go again BLODs
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[A83] Re: Here we go again BLODs
I have in fact been able to fill the entire screen with BLODs, but I
wont take credit for how it was managed. Someone sent it (I think directly
to me, in relation to Calcsys, but it may have been to the list), but I
don't remember their name. Just output (to port 10h of course) 1Ch, then
1Fh, then repeat until the screen is full of blue lines. It doesn't help
you control them too much I think, but it's something.
Just to note, the above procedure works on the TI-73 and TI-83 Plus. I
haven't tried on the TI-83. On the TI-83 Plus Silver Edition, just
outputting a value of 1Fh turned the entire screen to BLOD (no, it was not
just high contrast). Additionally, it turned on half a column of pixels
that's not on the screen. Don't even ask me how it makes any sense, but on
the lower right side of the LCD, past where the normal screen ends, about
half a column of pixels appeared.
To answer Frank's original question, no I've never tried writing data to
the LCD while it was displaying a BLOD. That might be something to try,
just to see what happens.
-Dan Englender
----- Original Message -----
From: "Olle Hedman" <oh@hem.passagen.se>
To: <assembly-83@lists.ticalc.org>
Sent: Tuesday, June 05, 2001 8:35 AM
Subject: [A83] Re: Here we go again BLODs
>
> At 14:08 2001-06-05, you wrote:
> >BLOD = Blue Line Of Death
> >I thought most people here would have heard of that, it was a pretty
in-depth
> >discussion.
>
> Oh. Like I said, write out the abbrevation, and everything becomes so much
> clearer :)
> In my head theese BLODs had been sorted into a interesting sideeffect of
> the lcd, and nothing useful. Thats why I didn't make the connection
BLOD ->
> Blue Line Of Death, because the topic was serious. Thought it was some
> programming tech.
> Anyway. Sounds tricky to control the BLODs that well. As we all probably
> know by now, they appear when you set the LCD in "test mode". The only
info
> Toshiba (the maker of the LCD driver chip) gives on this command is "This
> command selects the test mode. Do not use this command." Then one line
> appears. There is no simple way (like writing a certain value) to control
> where on the LCD the BLOD appear.
> There might though (this is just my guessing) be possible to control it by
> timeing it with the LCD in some way.
> Do several calls to this testmode, with exact timeings, filling the
screen.
> _maybe_ possible. I don't have a 83 so I can't test.
> Has anyone been able to fill the screen with BLODs? Sounds awfully tricky
> to me.
> The only things I have seen that might be mistaken for this is setting the
> contrast really high.
>
> ///Olle
> (pdf with tech info about the LCD driver chip from Toshiba can, as always,
> be found on my site. here:
> http://alh.dhs.org/ftp/calculator/ti83/tech/t6a04.pdf )
>
>
>
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