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-
- {
- > how ever i know that the ET3000 use diference ways to get your
- > modes so this mite be your trouble..
- no, it can't, cause the mode is actually set and works, but some single lines
- (!) just don't work (and they change if I run the program twice or more) - so
- this screen is 256 lines high, and for example lines 3, 180, 185 and 200 are
- let's say gray - any idea why? (the amount of lines and which lines seem to be
- totally random)
-
- (* Original code by Bas van Gaalen. *)
- (* Modified for no vertical overscan *)
- (* and converted to unit by Antonio Sanchez *)
- }
- unit umodeq;
-
- interface
- type
- twrec=record reg:word; func,data:byte; end;
- twarr=array[0..24] of twrec;
-
- const
- vidseg:word=$a000;
-
- tweak:twarr=(
- (reg:$03d4; func:$00; data:$5f), { hor. total }
- (reg:$03d4; func:$01; data:$3f), { hor. display enable end }
- (reg:$03d4; func:$02; data:$40), { blank start }
- (reg:$03d4; func:$03; data:$82), { blank end }
- (reg:$03d4; func:$04; data:$4e), { retrace start }
- (reg:$03d4; func:$05; data:$9a), { retrace end }
- (reg:$03d4; func:$06; data:$23), { vertical total }
- (reg:$03d4; func:$07; data:$b2), { overflow register }
- (reg:$03d4; func:$08; data:$00), { preset row scan }
- (reg:$03d4; func:$09; data:$61), { max scan line/char heigth }
- (reg:$03d4; func:$10; data:$0a), { ver. retrace start }
- (reg:$03d4; func:$11; data:$ac), { ver. retrace end }
- (reg:$03d4; func:$12; data:$ff), { ver. display enable end }
- (reg:$03d4; func:$13; data:$20), { offset/logical width }
- (reg:$03d4; func:$14; data:$40), { underlinde location }
- (reg:$03d4; func:$15; data:$07), { ver. blank start }
- (reg:$03d4; func:$16; data:$17), { ver. blank end }
- (reg:$03d4; func:$17; data:$a3), { mode control }
- (reg:$03c4; func:$01; data:$01), { clock mode register }
- (reg:$03c4; func:$04; data:$0e), { memory mode register }
- (reg:$03ce; func:$05; data:$40), { mode register }
- (reg:$03ce; func:$06; data:$05), { misc. register }
- (reg:$03c0; func:$10; data:$41), { mode control }
- (reg:$3c2; func:$0; data:$e3), (* newly added *)
- (reg:$3c0; func:$13; data:$0)); (* newly added *)
-
- procedure setpal(col,r,g,b : byte);
- procedure initvga;
- procedure inittxt;
- procedure openregs;
- procedure closeregs;
- procedure setmodeq;
- procedure putpixel(x,y,c:byte);
- procedure fillscreen;
-
- implementation
-
- procedure setpal(col,r,g,b : byte);assembler; asm
- mov dx,03c8h; mov al,col; out dx,al; inc dx; mov al,r; out dx,al
- mov al,g; out dx,al; mov al,b; out dx,al; end;
-
- procedure initvga; assembler; asm mov ax,13h; int 10h; end;
- procedure inittxt; assembler; asm mov ax,3; int 10h; end;
-
- procedure openregs; assembler; asm
- mov dx,03d4h; mov al,11h; out dx,al; inc dx; in al,dx; and al,7fh
- mov ah,al; mov al,11h; dec dx; out dx,ax; end;
-
- procedure closeregs; assembler; asm
- mov dx,03d4h; mov al,11h; out dx,al; inc dx; in al,dx; or al,80h
- mov ah,al; mov al,11h; dec dx; out dx,ax; end;
-
- procedure setmodeq;
- var i:byte;
- dummy : byte;
- begin
- initvga;
- openregs;
- for i:=0 to 24 do
- with tweak[i] do
- begin
- IF reg=$3c0
- then begin
- dummy:=port[$3da]; { reset read/write flip-flop }
- port[$3c0]:= func or $20; { ensure vga output is enabled }
- port[$3c0]:= data;
- end
- else if (reg=$3c2) or (reg=$3c3)
- then port[reg]:=data { directly to the port }
- else begin
- port[reg]:=func; { index to port }
- port[reg+1]:=data;{ value to port+1 }
- end;
- end;
- closeregs;
- end;
-
- procedure putpixel(x,y,c:byte); assembler;
- asm
- mov es,vidseg
- mov bh,[y]
- mov bl,[x]
- mov al,[c]
- mov [es:bx],al
- end;
-
- procedure fillscreen; assembler;
- asm
- mov es,vidseg
- xor cx,cx
- @loop:
- mov di,cx
- mov al,cl
- add al,ch
- mov [es:di],al
- inc cx
- jnz @loop
- end;
- end.
-
- {
- well, I have no simple example for that unit now, but for example just fill the
- screen each line with a different color, and you'll see... (BTW, works on a
- ET4000 and on my new Cirrus Logic-based card...)
- }