Pascal programmer please help!
I want to do the following:

My knowledge of vga programming is very limited so please help me right
if I say something wrong.  As far as I know one full 640x480x265color
page will take up 256k of the VGA card's memory.  Now say I for example
write the four full screen pictures to a 1Meg. SVGA card, only the first
one will be displayed(0,0,639,479).  Isn't there a way to switch to these
other three pages using BGI? Even better isn't there a way how you can
change the visual page with only a few coords?

FOR ex.

This is a representation of a 1 Meg. VGA card
      1                300               640
                              1280

----------------------------------------------------------------------------
-
| |-----------------------------|                                          |
 1
| |                                           |
       |
| |                      |
                   |
| |                      |                                                 |
| |                      |                                         |
| |-----------------------------|                                          |
 480
|                                                                  |
|                                                                  |
|                                                                  |
|                                                                  |
|                                                                  |
----------------------------------------------------------------------------
--  960

The current "viewing coords." is starting at 1,1 ending at 640,480
Can't you change this to for ex. starting at 100,100 ending at 740,580?
If this is possible would it be possible to use this as a scrolling
tecnique?

Basically what I want is a routine/procedure that can view every part of a
VGA
card.

Help in any way will be welcome
Please reply via E-mail

Thanks in advance
Pierre van Rooyen

check out the VESA specs, there is some function to set the starting point
(in video memory) of the screen buffer.

ftp://x2ftp.oulu.fi/pub/msdos/programming/specs/vesasp12.zip

Note that the current specification is 1.2 code will still work with cards
which implement 2.0 VESA functions.  Also, AFAIK there's no plaintext version
of the VESA 2.0 *final* VESA 2.0 specification (though you can find a draft in
the same directory as vbe20.zip).

Also, BGI is notoriously slow.  You'd do better to either get a VESA library
and work with that, or start reading and create your own.