video modes

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b1528932

Joined: 21 May 2010
Posts: 287

b1528932 01 Mar 2011, 05:51

whats the diffrence between mode 0 and 1/2 and 3 using int 10 interface?
They both do the same and there is no diffrence.

01 Mar 2011, 05:51

neville

Joined: 13 Jul 2008
Posts: 507
Location: New Zealand

neville 01 Mar 2011, 09:11

huh

mode 0 = 40x25 B/W
mode 1 = 40x25 16 colours
mode 2 = 80x25 16 shades of grey
mode 3 = 80x25 16 colours

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01 Mar 2011, 09:11

sinsi

Joined: 10 Aug 2007
Posts: 786
Location: Adelaide

sinsi 01 Mar 2011, 09:37

I think that the 16 grey shades were for CGA/EGA only (mode 0 and 2).
For MCGA/VGA all 4 modes are 16 colours.

01 Mar 2011, 09:37

neville

Joined: 13 Jul 2008
Posts: 507
Location: New Zealand

neville 01 Mar 2011, 18:51

sinsi wrote:

I think that the 16 grey shades were for CGA/EGA only (mode 0 and 2).
For MCGA/VGA all 4 modes are 16 colours.

But I was just trying to show b152 that the original definitions for CGA and EGA adapters were indeed different. All he is seeing is the "modern" VGA emulation of those Wink

Why he's even bothering with them I don't know...

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FAMOS - the first memory operating system

01 Mar 2011, 18:51

b1528932

Joined: 21 May 2010
Posts: 287

b1528932 05 Mar 2011, 10:30

when i change video mode, can i assume certain cursor size/position, selected page and blikn/intensity setting?

05 Mar 2011, 10:30

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