[ColorForth] Graphic compability

["t" <loveall@xxxxxxxxx>]

Checking the BIOS interrupt at
http://www.ctyme.com/intr/rb-0274.htm
root:
http://www.ctyme.com/intr/cat.htm
says the physical address of linear video buffer is located at offset _28h_ in
the buffer.

On my VAIO 505g, debug shows a dd value of FD00:0000h located at that position
(no, I don't have colorForth running on it. The floppy controller is behind a
PCMCIA interface).which is what Win98 reports as a starting phyical address for
the display.

Regards,
Terry

----- Original Message -----
From: "Jimmy Söderman" <hiraganagos@xxxxxxxxxxx>
To: "ColorForth List Member" <ColorForth@xxxxxxxxxxxxxxxxxx>
Sent: Sunday, June 16, 2002 12:33 PM
Subject: [ColorForth] Graphic compability


> ok as begigning to see responses, ill post this , where ive implemented it
> into boot.asm, added comments what i do.
>
> I also sizeoptimized some of the old code that were there to make it fit
> better.
>
> remeber its just step one, so dont try run this just yet
> I still have to figure out hot AGP bit is working in detail, bc this is
> whats gonna be partly replaced.
>
> Just match it in, writing over the old parts
>
> As its a standard way since 1996-1998 and now works on 99.9% graphics cards
> (S3 and onwards).
>
> Put into Boot.asm (i guess would need other changes too, so its just an
> suggestion.)
> mov di,ModeInfoTable ; 256 byte table needs reserved anywhere in memory.
> (our 32bit address will then be located here at offset 20h)
> mov ax,04f01h
> mov cx,4114h     ; 800x600 ( use 4117h if you want 1024x768 )
> int 10h
>
> mov ax,04f02h
> mov bx,4114h     ; 800x600 ( use 4117h if you want 1024x768 )
> int 10h
>
> And now, later when in 32bit mode, and you want to have the graphicaddress,
> just fetch 32bit-address at ModeInfoTable+20h, no hardwarespecific probing
> needed.
>
>
>
>
>
>
>
>
> >From: "Jimmy Söderman" <hiraganagos@xxxxxxxxxxx>
> >Reply-To: ColorForth@xxxxxxxxxxxxxxxxxx
> >To: "ColorForth List Member"  <ColorForth@xxxxxxxxxxxxxxxxxx>
> >Subject: [ColorForth] Graphic compability
> >Date: Sun, 16 Jun 2002 09:46:33 +0000
> >
> >
> >As i discovered there is more or less serious incompability with
> >graphiccards & ColorFORTH, and i hope ive spotted the "problem",
> >i might be wrong though., Ok im now going rather technical, so here we go:
> >
> >It seem to use (VESA) VBE BIOS to set its graphicsmode, but hardware
> >probing for getting the actual startaddress of grahics.
> >VBE utilizes a standarzed way to get to that, without probing, ill post a
> >snippet ill used succesfully in my own projects, and Chuck, or someone else
> >might wanna test it.
> >
> >As its a standard way since 1996-1998 and now works on 99.9% graphics cards
> >(S3 and onwards).
> >
> >Put into Boot.asm (i guess would need other changes too, so its just an
> >suggestion.)
> >mov di,ModeInfoTable  ; 256 byte table needs reserved anywhere in memory.
> >mov ax,04f01h
> >mov cx,4114h     ; 800x600 ( use 4117h if you want 1024x768 )
> >int 10h
> >mov ax,04f02h
> >mov bx,4114h     ; 800x600 ( use 4117h if you want 1024x768 )
> >int 10h
> >
> >And now, later when in 32bit mode, and you want to have the graphicaddress,
> >just fetch 32bit-address at ModeInfoTable+20h, no hardwarespecific probing
> >needed.
> >
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