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> OS Construction > How does Linux set it's high res text mode?Goto page Previous 1, 2 |
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rnop 27 Jun 2010, 18:50
For bootsector use
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27 Jun 2010, 18:50 |
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dakoder 30 Jun 2010, 22:37
mov eax,0x1112
int 0x10 This BIOS call work for me giving 80x48 mode 3 text it just doubles the scanlines and therefore has a much higher screen refresh update to a vesa mode. Graham |
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30 Jun 2010, 22:37 |
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baldr 01 Jul 2010, 00:05
dakoder,
80×50, perhaps (80×43 on EGA)? It doesn't double anything, just loads 8×8 character generator and reprograms videocontroller to accommodate changed character cell height. In the similar way one can reprogram VGA to use 480 scan lines in text mode (instead of regular 400) and achieve 80×30 (80×60 if 8×8 chargen is used) resolution text mode. |
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01 Jul 2010, 00:05 |
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dakoder 01 Jul 2010, 13:57
baldr wrote: dakoder, yeah EGA. as you say VGA just changed the font. graham |
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01 Jul 2010, 13:57 |
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edfed 01 Jul 2010, 23:51
it is possible to achieve a very high text resolution with frame buffer.
frame buffer is the vesa double buffer for graphic mode. using a graphic font, but emulating a text mode. it lets linux print a picture behind the console, or add many graphical effects to an apparent text mode. for exemple, using 1024*768 with a 8*8 font will give a text resolution of: 1024/8 * 768/16 = 128 * 96. it is many more than 80*25 text mode. i use a 8*5 (9*6) fixed font, in 1024*768, it can give a text resolution of 170*85. the modes numbers for vesa text modes: Code: mode columns rows 108h 80 60 109h 132 25 10ah 132 43 10bh 132 50 10ch 132 60 |
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01 Jul 2010, 23:51 |
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