I am fixing to make a text reader programing running under dos/v
(Japanese Dos)  If you know, Japanese Dos runs under a 640x480 pixel
screen; therefore normal text reader with the screen size of 80x25
characters  will not work under dos/v.  So, in order to make a dos/v
text reader I have to set up a TEXTMODE screen that is equvalent to
640 x 480 pixel screen. I am currently using TP 5.5 and it does not
have a text mode that suports 640x480, like VGA.  Is there a text mode
that goes beyond 80 x 25 characters? If so how is it accomplished?

: Thanks in advance,
: -Henry
: T...@why.net  
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there is a way to get into 640x480x256,

asm
  mov   ax,002eh
  int   10h
end;

I tried implementing the asm codes by putting it right after

BEGIN
ASM

...
....
end;

This asm code clears the screen and sometime acts like the DIR
command.  I also tried changing the 002xh code it does not work.
Any more solution to my problem?

-Henry

In article <mangledDqpF1E....@netcom.com>,

Or do you want a normal text mode that has greater resolution than 80 x
25?

Yes, looking at the documentation for the video card is probably one of the
best solutions.  Usually both VESA mode numbers (16-bit) and OEM mode
numbers (8-bit) should be listed.  VESA modes are standardized; OEM modes
vary from card to card.

If your card supports VESA (or if you've installed a driver such as UNIVBE),
you can still usually get the OEM mode number from memory:

asm
  mov   ax,4f02h
  mov   bx,0101h {VESA 640x480x256}
  int   10h
end;

OEM_mode := mem[$0040:$0049];

This byte usually contains the current 8-bit mode number on any properly
behaving video card.

Also, some good texts to read:

The VESA 1.2 specification.  There is also a version 2.0 specification
available, though in draft form.

VGADOC4B.ZIP.  A collection of text files on a wide range of different video
implementations.  Also includes some Turbo Pascal source.  I'm not sure if I
have the archive name correct, although I know that it's VGADOC4?.ZIP.

: Bad advise. Playing randomly with video modes could at worst destroy the
: monitor. A proper solution is to find proper documentation.

: Osmo

hmm.. well, when i did it, it went to 640x480x256.. i use 0013h (instead
of 002eh) for 320x200x256, and i use that quite a bit.. it's a great way
to do graphics without a bgi.