mandrake questions

[dragonlady <dragonlady@xxxxxxxxxx>]

Hello all
 
 I am somewhat new to linux,had it installed on a system a few years
ago,then got too busy to realy pay any attention to it,so I am a reborn
newbie.

 But I just installed mandrake 6.0,and am trying to get the xwindows
display changed around somehow
 right now it is in 800x600 @256 colors,but the actual display area is
only 640 480,I'd like to get rid of the 'virtual' 800x600,and get it to
an actual size in 16 bit colors but haven't found any way of doing so
  the display is configured correctly,as far as vid card and monitor go,

I even swapped out a trident 1685 card (jaton video67 tv) in favor of
one that they had listed,(generically S3 virge)and selected a Sony
crystalscan 15 for my Gateway vivitron 1572,which isn't listed as such
in the install.
  
 what do I edit,to change it,or what selection should I make on a fresh
install? 
  
  I could live with the 256 colors,and I could live with the
640x480,though I'd like more,800x600@16bit is my normal mode in all
systems so I'm pretty used to it.I just don't like the scrolling
desktop,it makes it REAL hard to actualy do any work,or read any kind of
document/help file etc.
  
   I have been browsing through the docs etc,but haven't found any
reference to changing the display other than during install, where I was
asked to choose display modes (8,16,and 24 bit,and 640/480 to 1024/768
etc and up)

  thanks in advance.
 
 (now I'll log out and find the info in the first file I start looking
in!)

merc.