Int 10h and custom character set

[Konstantin Novikov]

Hello, dear SeaBIOS community. I need your help.

I want to change character set with my own character table. Now I'm trying
to use Int 10h, function 11h. As SeaBIOS works with mode #3 by default
(text mode, 80x25 cells), I'm calling subservice 0h for set my table with
8x16 characters.

But It' doesn't work. Characters are changed, but symbol's form isn't
depends on what's my table contains. I think, It happens because I need to
set table pointer in registers es and bp. In flat model I can't get value
of segment, which contains my table.

I tried to write 0 in es register and allocate memory in low zone - didn't
changed anything.

So, can you help me? Maybe, I just using wrong way, and solution is much
easier?

Thank you for attention.
Novikov Konstantin

[Konstantin Novikov]

Hello again.

I want to update my progress, maybe it's can be useful for someone.
Yes, it's all about es register. Solution is to place a character table in
0000:FFFF addresses. Now I see my own characters on the screen.
It's may be tricky way, because I can't allocate memory and write via
address without allocation, but table can be overwritten when interrupt is
done.

If anyone knows much clever way - you're welcome, this is very interesting
information for me.

Konstantin Novikov

ср, 10 июл. 2019 г., 11:53 Konstantin Novikov <
[e-mail]>:
> Hello, dear SeaBIOS community. I need your help.
>
> I want to change character set with my own character table. Now I'm trying
> to use Int 10h, function 11h. As SeaBIOS works with mode #3 by default
> (text mode, 80x25 cells), I'm calling subservice 0h for set my table with
> 8x16 characters.
>
> But It' doesn't work. Characters are changed, but symbol's form isn't
> depends on what's my table contains. I think, It happens because I need to
> set table pointer in registers es and bp. In flat model I can't get value
> of segment, which contains my table.
>
> I tried to write 0 in es register and allocate memory in low zone - didn't
> changed anything.
>
> So, can you help me? Maybe, I just using wrong way, and solution is much
> easier?
>
> Thank you for attention.
> Novikov Konstantin

[Mike Banon]

Hope you can share your source code modifications, in the case someone
else would find them useful.

On Fri, Jul 12, 2019 at 8:19 AM Konstantin Novikov
 wrote:
> Hello again.
>
> I want to update my progress, maybe it's can be useful for someone.
> Yes, it's all about es register. Solution is to place a character table in 0000:FFFF addresses. Now I see my own characters on the screen.
> It's may be tricky way, because I can't allocate memory and write via address without allocation, but table can be overwritten when interrupt is done.
>
> If anyone knows much clever way - you're welcome, this is very interesting information for me.
>
> Konstantin Novikov
>
> ср, 10 июл. 2019 г., 11:53 Konstantin Novikov :
> > Hello, dear SeaBIOS community. I need your help.
> >
> > I want to change character set with my own character table. Now I'm trying to use Int 10h, function 11h. As SeaBIOS works with mode #3 by default (text mode, 80x25 cells), I'm calling subservice 0h for set my table with 8x16 characters.
> >
> > But It' doesn't work. Characters are changed, but symbol's form isn't depends on what's my table contains. I think, It happens because I need to set table pointer in registers es and bp. In flat model I can't get value of segment, which contains my table.
> >
> > I tried to write 0 in es register and allocate memory in low zone - didn't changed anything.
> >
> > So, can you help me? Maybe, I just using wrong way, and solution is much easier?
> >
> > Thank you for attention.
> > Novikov Konstantin
>
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