Detecting Colour and Monochrome Monitors: Difference between revisions
Jump to navigation
Jump to search
| [unchecked revision] | [unchecked revision] |
Content added Content deleted
m (removed unused variable from the code snippet) |
m (Bot: Replace deprecated source tag with syntaxhighlight) |
||
| (2 intermediate revisions by 2 users not shown) | |||
| Line 2: | Line 2: | ||
== The Function == |
== The Function == |
||
< |
<syntaxhighlight lang="c"> |
||
#include <stdint.h> |
|||
/* |
|||
Video card mono/colour detection. |
|||
enum video_type |
|||
Return values: false=colour |
|||
true=monochrome |
|||
*/ |
|||
_Bool detectVideoType(void) |
|||
{ |
{ |
||
VIDEO_TYPE_NONE = 0x00, |
|||
char c=(*(volatile USHORT*)0x410)&0x30; |
|||
VIDEO_TYPE_COLOUR = 0x20, |
|||
VIDEO_TYPE_MONOCHROME = 0x30, |
|||
}; |
|||
uint16_t detect_bios_area_hardware(void) |
|||
//c can be 0x00 or 0x20 for colour, 0x30 for mono. |
|||
{ |
|||
return (c==0x30); |
|||
const uint16_t* bda_detected_hardware_ptr = (const uint16_t*) 0x410; |
|||
return *bda_detected_hardware_ptr; |
|||
} |
|||
enum video_type get_bios_area_video_type(void) |
|||
{ |
|||
return (enum video_type) (detect_bios_area_hardware() & 0x30); |
|||
} |
} |
||
</syntaxhighlight> |
|||
</source> |
|||
[[Category:Video]] |
[[Category:Video]] |
||
[[Category:Hardware Detection]] |
|||
Latest revision as of 05:13, 9 June 2024
Detecting whether a user has a colour or monochrome video card is a trivial task. The BIOS data segment has a value in it for this information. Below is a function (in ISO C) to retrieve this:
The Function
#include <stdint.h>
enum video_type
{
VIDEO_TYPE_NONE = 0x00,
VIDEO_TYPE_COLOUR = 0x20,
VIDEO_TYPE_MONOCHROME = 0x30,
};
uint16_t detect_bios_area_hardware(void)
{
const uint16_t* bda_detected_hardware_ptr = (const uint16_t*) 0x410;
return *bda_detected_hardware_ptr;
}
enum video_type get_bios_area_video_type(void)
{
return (enum video_type) (detect_bios_area_hardware() & 0x30);
}