From:	cumani AT dns DOT ien DOT it
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Using the fonts stored in the ROM
Date:	Fri, 15 May 1998 11:37:11 +0200
Organization:	Politecnico di Torino - Italia
Lines:	34
Message-ID:	<355C0CC7.28CC@is.ien.it>
References:	<01bd7f95$80a9aca0$LocalHost AT default>
NNTP-Posting-Host:	vega.ien.it
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Dark Angel wrote:
> 
> I am trying to use the text fonts stored in the ROM of the EGA/VGA, but i
> am having some trouble.
> 
> I am using the function 1130h of the interrupt 10h to get the segment and
> offset of the font. I already know the addressing in protected mode is
> different, so i used _dmpi_segment_to_descriptor to get a descriptor for
> the segment returned by the function call.
> Then i used _farpeekb(selector, offset) to get the bytes from the memory: i
> got a segmentation fault!
> I tryed another way: _farpeekb(_dos_ds, segment*16+offset): i still got a
> segmentation fault!
> 
> I have tryed this in real mode and it worked. I know the segment (ffffh)
> and offset(e67c) returned by the funtion call are correct.
> 

I cant't help you with descriptors and such, but I have used the second
method, i.e.

_farpeekb(_dos_ds, segment*16+offset)

in several programs, without any problem (well, actually I used
dosmemget() to get all the font at once, but that should make no
difference).

Maybe the problem is somewhere else in your code?

-- 
Ing. Aldo Cumani <cumani AT is DOT ien DOT it>
Istituto Elettrotecnico Nazionale
Str. delle Cacce, 91
10135 Torino

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