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CD ROM Paradise Collection 4
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CD ROM Paradise Collection 4 1995 Nov.iso
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0173_Set Secondary Page Position.pas
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Pascal/Delphi Source File
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1995-03-03
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1KB
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49 lines
{
> What I need to know is how I can use that information as well
> as which registers to use (ax,dx etc) to write or read from a
> specific field of a register without affecting other fields.
Well, get a VGADOC, number three is the latest: VGADOC3.???. Then you know
which ports can do what..Secondly: get my graphics package (for instance),
called GFXFX.???, in which you can see how to play with these ports
}
procedure setlinecomp(ad:word); assembler;
asm
mov dx,3d4h
mov al,18h
mov ah,[byte(ad)]
out dx,ax
mov al,7
out dx,al
inc dx
in al,dx
dec dx
mov ah,[byte(ad)+1]
and ah,00000001b
shl ah,4
and al,11101111b
or al,ah
mov ah,al
mov al,7
out dx,ax
mov al,9
out dx,al
inc dx
in al,dx
dec dx
mov ah,[byte(ad)+1]
and ah,00000010b
shl ah,5
and al,10111111b
or al,ah
mov ah,al
mov al,9
out dx,ax
end;
{
These procedure sets the position of the secondary page. Try it out. As far
as I know it should work in every mode, not only mode-x, though it was
designed
}