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- Hercules Graphics Adapter
-
- 3B0h synonym for 3B4h
-
- 3B1h synonym for 3B5h
-
- 3B2h synonym for 3B4h
-
- 3B3h synonym for 3B5h
-
-
-
- 3B8h (W)
- bit 1 Hercules graphics mode if set, text mode else
- 3 Video enabled if set
- 5 Blink enabled if set
- 7 Graphics page 1 displayed if set, page 0 else
-
- 3BAh (R) Status Register
- bit 0 Horizontal sync
- 3 Video signal
- 7 Vertical sync
-
- 3BAh (W) Mode Select Register
- bit 3 132-column text for monochrome
-
- 3BBh (W) Lightpen Strobe Reset
- Writing to this register will clear the lightpen strobe.
-
- 3BFh (W)
- bit 0 Setting of graphics mode bit (3B8h bit 1) enabled if set
- 1 Setting of graphics page bit (3B8h bit 7) enabled if set
-
-
- ID Hercules Graphics Card:
-
- old:=rdinx($3B4,$a);
- outp($3B5,6); {Change Cursor End}
- for x:=1 to 50 do; {Wait for CRTC to respond}
- val:=inp($3B5);
- outp($3B5,old);
- if val=6 then
- begin
- x:=50000;
- repeat
- dec(x);
- y:=inp($3BA);
- until (y and $80)=0) or (x=0);
- if x=0 then __MDA__
- else
- case y and $70 of
- $50:Hercules Incolor;
- $10:Hercules Graphics Plus
- else Hercules Graphics Card;
- end;
- end;
-
-
-
-
- Hercules GRAFIX BIOS Interface:
- GRAFIX is a memory resident program, not a part of the Hercules Graphics Card.
-
- ----------1040-------------------------------
- INT 10 - VIDEO - SET GRAPHICS MODE (Hercules GRAFIX)
- AH = 40h
- SeeAlso: AH=41h
- ----------1041-------------------------------
- INT 10 - VIDEO - SET TEXT MODE (Hercules GRAFIX)
- AH = 41h
- SeeAlso: AH=40h
- ----------1042-------------------------------
- INT 10 - VIDEO - CLEAR CURRENT PAGE (Hercules GRAFIX)
- AH = 42h
- SeeAlso: AH=45h
- ----------1043-------------------------------
- INT 10 - VIDEO - SELECT DRAWING PAGE (Hercules GRAFIX)
- AH = 43h
- AL = page number (0,1)
- SeeAlso: AH=44h,AH=45h
- ----------1044-------------------------------
- INT 10 - VIDEO - SELECT DRAWING FUNCTION (Hercules GRAFIX)
- AH = 44h
- AL = drawing function
- 00h clear pixels
- 01h set pixels
- 02h invert pixels
- SeeAlso: AH=44h,AH=46h,AH=4Ch,AH=4Dh
- ----------1045-------------------------------
- INT 10 - VIDEO - SELECT PAGE TO DISPLAY (Hercules GRAFIX)
- AH = 45h
- AL = page number (0,1)
- SeeAlso: AH=42h,AH=43h
- ----------1046-------------------------------
- INT 10 - VIDEO - DRAW ONE PIXEL (Hercules GRAFIX)
- AH = 46h
- DI = x (0-720)
- BP = y (0-347)
- Note: function 44h determines operation and function 43h which page to use
- SeeAlso: AH=0Ch,AH=47h,AH=49h,AH=4Ch,AH=4Dh
- ----------1047-------------------------------
- INT 10 - VIDEO - FIND PIXEL VALUE (Hercules GRAFIX)
- AH = 47h
- DI = x (0-720)
- BP = y (0-347)
- Return: AL = 00h pixel clear
- AL = 01h pixel set
- Note: function 43h specifies which page is used
- SeeAlso: AH=0Dh,AH=46h
- ----------1048-------------------------------
- INT 10 - VIDEO - MOVE TO POINT (Hercules GRAFIX)
- AH = 48h
- DI = x (0-720)
- BP = y (0-347)
- SeeAlso: AH=49h
- ----------1049-------------------------------
- INT 10 - VIDEO - DRAW TO POINT (Hercules GRAFIX)
- AH = 49h
- DI = x (0-720)
- BP = y (0-347)
- Note: function 48h or 49h specify first point, 44h operation and 43h
- page to use
- SeeAlso: AH=43h,AH=44h,AH=48h,AH=4Ch,P = y (0-347)
- Note: unlike the other BIOS character functions character position is
- specified in pixels rather than rows
- DI = x coordinate of lower left corner
- BP = y coordinate of lower left corner
- BX = height in pixels
- CX = width in pixels
- Note: draws a solid rectangle
- SeeAlso: AH=4Eh
- ----------104B-------------------------------
- INT 10 - VIDEO - DISPLAY CHARACTER (Hercules GRAFIX)
- AH = 4Bh
- AL = character to display
- DI = x (0-720)
- BP = y (0-347)
- Note: unlike the other BIOS character functions character position is
- specified in pixels rather than rows and columns
- SeeAlso: AH=09h,AH=0Ah
- ----------104C-------------------------------
- INT 10 - VIDEO - DRAW ARC (Hercules GRAFIX)
- AH = 4Ch
- AL = quadrant (1 = upper right, 2 = upper left, et cetera)
- DI = x coordinate of center
- BP = y coordinate of center
- BX = radius
- SeeAlso: AH=49h,AH=4Dh
- ----------104D-------------------------------
- INT 10 - VIDEO - DRAW CIRCLE (Hercules GRAFIX)
- AH = 4Dh
- DI = x of center
- BP = y of center
- BX = radius
- SeeAlso: AH=49h,AH=4Ch
- ----------104E-------------------------------
- INT 10 - VIDEO - FILL AREA (Hercules GRAFIX)
- AH = 4Eh
- DI = x coordinate of an interior point
- BP = y coordinate of an interior point
- Notes: fills convex polygonal areas
- the first fill makes the figure solid, the second erases it
- SeeAlso: AH=4A
-