-REZ CHECK-

                          CODED BY MR. PINK

                       (C) 1995 RESERVOIR GODS

This ones for all you coders out there - raise your xbios calls in the
air like you just don't  care!  Rez  check  is  useful if you are just
starting to find your way around the maze of Falcon video resolutions,
giving you clear and concise info on the current screen mode.

Rez check analyses the bits  of  the  Xbios VsetMode call and displays
them. It doesn't cover all the VIDEL registers, but you shouldn't need
to use them if you  want  to  retain  compatibility across all Falcons
(especially the new ones when they are released!).

There are 7 defined components of screen mode:

Colours: this can be mono, 16, 256 or true colour. This is represented
by bits 0-2 of the mode word.
Columns: can be 40 or 80 (bit 3)
VGA flag: tells whether RGB or VGA monitor attached (bit 4)
PAL/NTSC: display type (bit 5)
Overscan: are you killing those horrid borders? (bit 6)
ST mode: in ST compatibility mode? (bit 7)
Vertical: represents whether  interlace  is  on  (RGB)  or double line
(VGA) and is flagged by bit 8.

Bits 9-15 are unused and this program callously ignores them.

Also displayed are the mode code  in  hex  (only three bytes needed as
the most significant nibble  of  the  high  byte  is  always zero) and
binary. You can use this  hex  value  for  setting  the screen in your
program. Its best to use  the  xbios  vsetscreen call, with 'modecode'
being the hex value you noted down from -Rez Check-.

        move.w  modecode,-(a7)
        move.w  #3,-(a7)                ;VsetMode option
        pea     physic
        pea     logic
        move.w  #5,-(a7)
        trap    #14
        lea     14(a7),a7

Don't forget then after you have used this setscreen call you won't be
able to use the AES, so if you  want  to call things like the GEM file
selector you will have to restore the screen back into its old mode.

Its that easy. Honest. Have fun!