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4 changed files with 12 additions and 12 deletions
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@ -50,9 +50,9 @@ start proc near
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;
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; Set driver to use the 8x8 font.
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;
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mov ah,11h ;VGA BIOS character generator function,
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mov al,30h ; return info subfunction
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mov bh,3;get 8x8 font pointer
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mov ah,11h ;VGA BIOS character generator function,
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mov al,30h ; return info subfunction
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mov bh,3 ;get 8x8 font pointer
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int 10h
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call SelectFont
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;
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@ -129,12 +129,12 @@ DrawChar proc near
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pop ds
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mul di ;calculate offset of start of row
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push di ;set aside screen width
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mov di,cx ;set aside the column
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and cl,0111b ;keep only the column in-byte address
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mov di,cx ;set aside the column
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and cl,0111b;keep only the column in-byte address
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shr di,1
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shr di,1
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shr di,1 ;divide column by 8 to make a byte address
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add di,ax ;and point to byte
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shr di,1 ;divide column by 8 to make a byte address
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add di,ax ;and point to byte
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;
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; Calculate font address of character.
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;
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@ -142,7 +142,7 @@ DrawChar proc near
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shl bx,1 ;assumes 8 bytes per character; use
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shl bx,1 ; a multiply otherwise
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shl bx,1 ;offset in font of character
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add si,bx ;offset in font segment of character
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add si,bx ;offset in font segment of character
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;
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; Set up the GC rotation.
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;
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@ -22,7 +22,7 @@ SC_MAP_MASK equ 2 ;SC map mask register index
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GC_INDEX equ 3ceh ;GC index register
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GC_SET_RESET equ 0 ;GC set/reset register index
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GC_ENABLE_SET_RESET equ 1 ;GC enable set/reset register index
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GC_ROTATE equ 3 ;GC data rotate/logical function
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GC_ROTATE equ 3 ;GC data rint 3otate/logical function
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; register index
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GC_MODE equ 5 ;GC Mode register
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GC_BIT_MASK equ 8 ;GC bit mask register index
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