GRFCONFIG(8) | System Manager's Manual (amiga) | GRFCONFIG(8)

# NAME

`grfconfig` —
alter grf device screen mode definitions at run time

# SYNOPSIS

`grfconfig` | [`-r`] device [file]

# DESCRIPTION

`grfconfig` is used to change or view the screen mode definition list contained in a grf device. You may alter the console screen definition as well as the definitions for the graphic screen. The console will automatically reinitialize itself to the new screen mode.

The following flags and arguments are interpreted by `grfconfig`:

`-r`
  Print out a raw listing of the mode definitions instead of the pretty list normally shown.
device
  The grf device to manipulate. This argument is required.
file
  The file which contains the mode definitions. If this argument is not specified, `grfconfig` will print out of a list of the modes currently loaded into the grf device.

# MODE DEFINITION FILE

The mode definitions are taken from a file which has lines of the format:

num clk wid hi dep hbs hss hse ht vbs vss vse vt flags

num
  The mode number or 'c' for the console mode.
clk
  The pixel clock in Hz.
wid
  The screen mode's width.
hi
  The screen mode's height.
dep
  The bitdepth of the mode. Use 4 for a text console mode.
hbs hss hse ht
  The horizontal timing parameters for the mode in pixel values. All the values are relative to the end of the horizontal blank (beginning of the displayed area).
vbs vss vse vt
  The vertical timing parameters for the mode in line values. All the values are relative to the end of vertical blank (beginning of the displayed area).
flags
  By default every mode uses negative horizontal and vertical sync pulses, it is non-interlaced and does not use scandoubling.
  default
    Use the default flags: -hsync -vsync
  doublescan
    Doublescan mode
  interlace
    Interlace mode
  +hsync
    Positive horizontal sync pulses
  -hsync
    Negative horizontal sync pulses
  +vsync
    Positive vertical sync pulses
  -vsync
    Negative vertical sync pulses
  sync-on-green
    Composite sync on green

     ------------------------------------------------------
     |                           ^                        |
     |                          vse                       |
     |      (0,0)                                         |
     |        *-----------------------------------        |
     |        |                  ^        ^      |        |
     |        |                 vbe       !      |        |
     |        |                           !      |        |
     |        |                           !      |        |
     |<-hse   |<-hbe                      !      |<-hbs   |      |      |
     |        |                           !      |   hss->| hse->| hbe->|
     |        |                          hi      |        |      |      |
     |        |                           !      |        |
     |        |                           !      |        |
     |        |<============ wid =========+=====>|        |
     |        |                           !      |        |
     |        |                           !      |        |
     |        |                           !      |        |
     |        |                           v      |        |
     |        ------------------------------------        |
     |                           ^                        |
     |                          vbs                       |
     |                                                    |
     ------------------------------------------------------
                                 ^
                                vss
                            - ------- -
                                 ^
                                vse
                            - ------- -
                                 ^
                                vbe

# SEE ALSO

console(4), grfcl(4), grfcv(4), grfcv3d(4), grfet(4), grfrh(4), grfrt(4), grful(4), iteconfig(8)

# HISTORY

The `grfconfig` command first appeared in NetBSD 1.0.

The mode definition file changed two times.

In NetBSD 1.0 all horizontal values were videoclock cycle values instead of pixel values:

num clk wid hi dep hbs hss hse hbe ht vbs vss vse vbe vt
1 31000000 640 480 8 80 86 96 102 104 480 489 492 517 520
2 31000000 640 480 8 80 86 96 102 104 240 244 246 258 260
3 31000000 640 480 8 80 86 96 102 104 960 978 984 1034 1040

In NetBSD 1.1 and NetBSD 1.2:

num clk wid hi dep hbs hss hse hbe ht vbs vss vse vbe vt
1 31000000 640 480 8 640 688 768 816 832 480 489 492 517 520
2 31000000 640 480 8 640 688 768 816 832 240 244 246 258 260
3 31000000 640 480 8 640 688 768 816 832 960 978 984 1034 1040

the vertical values were used to select the interlace or doublescan mode. All vertical values were half the width for the interlace mode and twice the width for the doublescan mode.

Beginning with NetBSD 1.3:

num clk wid hi dep hbs hss hse ht vbs vss vse vt flags
1 31000000 640 480 8 640 688 768 832 480 489 492 520 default
2 31000000 640 480 8 640 688 768 832 480 489 492 520 interlace
3 31000000 640 480 8 640 688 768 832 480 489 492 520 doublescan
4 31000000 640 480 8 640 688 768 832 480 489 492 520 +hsync +vsync

hbe and vbe are computed in the grf drivers.

# BUGS

`grfconfig` can not set the modes for /dev/grf1, /dev/grf2 and /dev/grf4 and it will not work for /dev/grf0.

October 7, 1994 | NetBSD 9.0