101 lines
1.8 KiB
NASM
101 lines
1.8 KiB
NASM
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title "Display Adapter type detection"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; video.asm
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;
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; Abstract:
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;
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; This module implements the assembley code necessary to determine
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; various display chip sets.
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;
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; Author:
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;
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; Shie-Lin Tzong (shielint) 04-Dec-1991.
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; Most of the code is taken from Win31 vdd and setup code(with modification.)
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;
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; Environment:
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;
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; x86 Real Mode.
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;
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; Revision History:
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;
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;
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;--
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FONT_POINTERS EQU 700h ; physical addr to store font pointers
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; This is also the DOS loaded area
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.386
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_DATA SEGMENT PARA USE16 PUBLIC 'DATA'
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_DATA ends
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_TEXT SEGMENT PARA USE16 PUBLIC 'CODE'
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ASSUME CS: _TEXT, DS:_DATA, SS:NOTHING
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;++
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;
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; VOID
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; GetVideoFontInformation (
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; VOID
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; )
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;
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; Routine Description:
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;
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; This function does int 10h, function 1130 to get font information and
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; saves the pointers in the physical 700h addr.
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;
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; Arguments:
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;
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; None.
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;
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; Return Value:
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;
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; None.
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;
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;--
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ASSUME DS:NOTHING
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public _GetVideoFontInformation
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_GetVideoFontInformation proc near
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push ds
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push es
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push bp
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push bx
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push si
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mov ax, FONT_POINTERS
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shr ax, 4
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mov ds, ax
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mov si, FONT_POINTERS
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and si, 0fh
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mov bh, 2
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@@:
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mov ax, 1130h ; Get font information
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int 10h
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mov [si], bp
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add si, 2
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mov [si], es
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add si, 2 ; (si)= 8
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inc bh
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cmp bh, 8
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jb short @b
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pop si
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pop bx
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pop bp
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pop es
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pop ds
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ret
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_GetVideoFontInformation endp
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_TEXT ENDS
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END
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