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CD ROM Paradise Collection 4 1995 Nov.iso
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0024_REMAPCGA.PAS.pas
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Pascal/Delphi Source File
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1993-05-28
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3KB
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151 lines
{
After several tricks to redefine Characters in EGA and VGA in this echo,
here is one you can use in CGA mode 4,5,6. You will find an Unit, and a
test Program.
}
Unit graftabl;
{
released into the public domain
author : Emmanuel ROUSSIN
FIDO : 2:320/200.21
Email : roussin@frmug.fr.mugnet.org
for using redefined Characters (128 to 255)
in CGA mode 4,5 and 6 Without using GRAFTABL.EXE
}
Interface
Type
Tcaractere8 = Array [1..8] of Byte;
Tgraftabl = Array [128..255] of Tcaractere8;
{
if you want to use only one font, define it in this Unit, For example :
Const
the_only_font : Tgraftabl = (
(x,x,x,x,x,x,x,x),
.
.
(x,x,x,x,x,x,x,x),
(x,x,x,x,x,x,x,x)
);
Or you can in your main Program :
Var
my_font : Tgraftabl;
and define it after
}
Var
seg_graftabl,
ofs_graftabl : Word;
{internal Procedures}
Procedure get_graftabl(Var segment, offset : Word);
Procedure put_graftabl(segment, offset : Word);
{Procedures to use in your Programs}
Procedure init_graftabl;
Procedure use_graftabl(Var aray : Tgraftabl);
Procedure end_graftabl;
Implementation
Procedure get_graftabl(Var segment, offset : Word);
begin
segment := memw[0 : $1F * 4 + 2];
offset := memw[0 : $1f * 4];
end;
Procedure put_graftabl(segment, offset : Word);
begin
memw[0 : $1f * 4 + 2] := segment;
memw[0 : $1f * 4] := offset
end;
Procedure init_graftabl;
{ interrupt 1F is a Pointer to bitmaps For high 128 Chars (8 Bytes per
Character) defined by GRAFTABL.EXE we save this initial Pointer }
begin
get_graftabl(seg_graftabl, ofs_graftabl);
end;
Procedure use_graftabl(Var aray : Tgraftabl);
{ we define a new Pointer : the address of an Array }
begin
put_graftabl(seg(aray),ofs(aray));
end;
Procedure end_graftabl;
{ we restore the original Pointer }
begin
put_graftabl(seg_graftabl,ofs_graftabl);
end;
end.
Program test;
Uses
Graph3, Crt, graftabl;
Var
font : Tgraftabl;
i,j,tmp : Byte;
rid : Char;
begin
hires;
init_graftabl;
fillChar(font,sizeof(font),0);
use_graftabl(font);
{$F000:$FA6E is the ROM address where the Characters 0 to 127 are defined}
For i := 1 to 26 do
For j := 0 to 7 do
begin
tmp := mem[$F000 : $FA6E + 97 * 8 + (i - 1) * 8 + j] xor $FF;
tmp := tmp xor $FF;
tmp := tmp or (tmp div 2);
font[i + 127, j + 1] := tmp;
{ Char 128 to 153 are redefined }
end;
For i := 1 to 26 do
For j := 0 to 7 do
begin
tmp := mem[$F000 : $FA6E + 97 * 8 + (i - 1) * 8 + j] or $55;
font[i + 153, j + 1 ] := tmp;
{ Char 154 to 181 are redefined }
end;
Writeln('the normal Characters ($61 to $7A) :');
Writeln;
For i := $61 to $7A do
Write(chr(i));
Writeln; Writeln;
Writeln('now, these same Characters, but thick :');
Writeln;
For i := 128 to 153 do
Write(chr(i));
Writeln; Writeln;
Writeln('the same Characters, but greyed :');
Writeln;
For i := 154 to 181 do
Write(chr(i));
rid := ReadKey;
end_graftabl;
Textmode(co80);
end.