getting info about the display, was: Re: Linux on the VR4121

[J. R. Westmoreland]

The code used in braille tty would not be very helpful since it uses the info
to talk to the BN from the outside.
What we need is the hardware internal information.
This would be things like "if you poke this byte at location x and poke the
cell number to be written at location y and then poke the bit pattern you want
displayed on the given cell at location z you will get that pattern to show on
the display."

If we can't get this info from PDI then we may have to do some SERIOUS
disassembly, oops shouldn't say that loudly, and find it the hard way.

I have downloaded cyace.exe and confir files as well as a version of linux for
the vr4121.
I have not tested any of this yet but it looks like you can run the cyace.exe
under CE and it will boot vmlinux.
This comes with MANY warnings chief amoug them being that this is almost
guaranteed to distroy all data in your flashdisk and system disk, at least the
writable part of the system disk.
Therefore, the wise will "make sure that you backup first".

More later...

J. R.



> ----- Original Message -----
>From: Gregory Nowak <greg at romuald.net.eu.org
>To: notelinux at romuald.net.eu.org
>Date: Mon, 16 Jun 2003 16:43:18 -0500
>Subject: getting info about the display, was: Re: Linux on the VR4121

>How could we go about figuring out stuff about the display?
>In a private correspondence with Frank, I mentioned that we could just look
at braille tty to figure out how they run the display.
>As Frank wisely pointed out, this wouldn't be so straight forward, due to the
fact that braille tty would be handling the display differently from the way
the bn runs it internally.

>But, braille tty is a gpl project, and they did something or other with PDI
to get the info they needed to support the braille note.

>So, Is there something that we could perhaps learn from their code, or could
we find out how they got PDI to give them the specs they wanted without
nondisclosure agreements?

>Just a thought.

>Greg


>On Mon, Jun 16, 2003 at 02:10:59PM -0700, J. R. Westmoreland wrote:
>> A good place to start is:
>> http://www.linux-vr.org
>> There are a few references to the VR4121 including the fact that they have
the
>> sound driver working.

>> Now, if we can get some info on the display for the BN etc I think we may
be
>> off and running.

>> J. R. Westmoreland


>>
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