[ColorForth] Graphic compability

[Bob Shafer <bobsh@xxxxxxxxx>]

I've made a couple of quick attempts at fixing up the source to do things 
like you describe. Unfortunately, I really don't know what I'm doing, 
assembler-wise (more hints would be appreciated :-). It would be really 
neat if this modification would open colorForth up to more people. Has 
anyone tried this technique, got it working where colorForth already works, 
and then taken it to a machine where the original doesn't work, with success?

At 09:46 AM 6/16/02 +0000, you wrote:

> 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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