Detecting Colour and Monochrome Monitors: Difference between revisions

Detecting Colour and Monochrome Monitors (view source)

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Revision as of 00:09, 26 October 2007 (view source) osdev>Yayyak (fixed error in commenting.) ← Older edit		Latest revision as of 05:13, 9 June 2024 (view source) Xtex (talk \| contribs) m (Bot: Replace deprecated source tag with syntaxhighlight)
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Line 1: Detecting whether a user has a colour or monochrome video card is a trivial task. The [[BIOS]] [[Memory Map (x86)#BIOS Data Area .28BDA.29\|data segment]] has a value in it for this information. Below is a function (in ISO C) to retrieve this: == The Function == <syntaxhighlight lang="c"> ~~<pre>~~ #include <stdint.h> /* ~~Video card mono/colour detection.~~ enum video_type ~~Return values: false=colour~~ ~~true=monochrome~~ / ~~_Bool detectVideoType(void)~~ { VIDEO_TYPE_NONE = 0x00, ~~_Bool type;~~ VIDEO_TYPE_COLOUR = 0x20, ~~char c=((volatile USHORT)0x410)&0x30;~~ VIDEO_TYPE_MONOCHROME = 0x30, }; uint16_t detect_bios_area_hardware(void) ~~//c can be 0x00 or 0x20 for colour, 0x30 for mono.~~ { ~~if(c==0x30){~~ const uint16_t bda_detected_hardware_ptr = (const uint16_t) 0x410; ~~return(true); //Monochrome monitor.~~ return bda_detected_hardware_ptr; ~~} else {~~ } ~~return(false); //Colour monitor.~~ } enum video_type get_bios_area_video_type(void) { return (enum video_type) (detect_bios_area_hardware() & 0x30); } </syntaxhighlight> ~~</pre>~~ [[Category:Video]] [[Category:Hardware Detection]]