diff options
Diffstat (limited to 'usr.sbin')
| -rw-r--r-- | usr.sbin/vidcontrol/vidcontrol.1 | 78 |
1 files changed, 47 insertions, 31 deletions
diff --git a/usr.sbin/vidcontrol/vidcontrol.1 b/usr.sbin/vidcontrol/vidcontrol.1 index 19a2c47..0ff7167 100644 --- a/usr.sbin/vidcontrol/vidcontrol.1 +++ b/usr.sbin/vidcontrol/vidcontrol.1 @@ -290,62 +290,78 @@ to capture the current contents of the video buffer. writes version and additional information to the standard output, followed by the contents of the terminal device. .Pp -PC video memory is typically arranged in two byte tuples, +VGA video memory is typically arranged in two byte tuples, one per character position. -In each tuple, the first byte -will be the character code, and the second byte is the -character's color attribute. +In each tuple, the first byte will be the character code, +and the second byte is the character's color attribute. .Pp -The color attribute byte is further broken down in to the -low nibble, which specifies which of 16 different foreground -colors is active, and the high nibble, which specifies which -of 16 different background colors is active. +The syscons driver converts the ^[[Nm terminal escapes +into the corresponding attribute bytes. +.Pp +The VGA color attribute byte looks like this: +.Pp +.Bl -column "X:X" "<00000000>" "width" "bright foreground color" +.Sy bits# Ta Ta Sy width Ta Sy meaning +.Li 7 Ta <X0000000> Ta 1 Ta character blinking +.Li 6:4 Ta <0XXX0000> Ta 3 Ta background color +.Li 3 Ta <0000X000> Ta 1 Ta bright foreground color +.Li 2:0 Ta <00000XXX> Ta 3 Ta foreground color +.El +.Pp +Here is a list of the three bit wide base colors with +their corresponding ANSI terminal escape codes +parenthesized (add 10 to get the background code): .Pp .Bl -hang -offset indent -compact .It 0 -Black +Black (30) .It 1 -Blue +Blue (34) .It 2 -Green +Green (32) .It 3 -Cyan +Cyan (36) .It 4 -Red +Red (31) .It 5 -Magenta +Magenta (35) .It 6 -Brown +Brown (33) .It 7 -White -.It 8 -Grey -.It 9 +Light Grey (37) +.El +.Pp +Base colors with bit 3 (the bright foreground flag) +set. The terminal escape for successive bright text +is ^[[1m. +.Pp +.Bl -hang -offset indent -compact +.It 0 +Dark Grey +.It 1 Light Blue -.It 10 +.It 2 Light Green -.It 11 +.It 3 Light Cyan -.It 12 +.It 4 Light Red -.It 13 +.It 5 Light Magenta -.It 14 +.It 6 Yellow -.It 15 +.It 7 White .El -.Pp -It can be seen that the last 8 colors are brighter -versions of the first 8. +.lt 1 .Pp For example, the two bytes .Pp .Dl "65 158" .Pp -specify an uppercase A (character code 65), in -yellow (low nibble 15) on a light blue background -(high nibble 9). +specify an uppercase A (character code 65), blinking +(bit 7 set) in yellow (bits 3:0) on a blue background +(bits 6:4). .Pp The .Nm |
