Date:	Mon, 3 May 1993 22:15 EST
From:	"Wonkoo Kim, EE, U. of Pittsburgh" <WKIM AT vms DOT cis DOT pitt DOT edu>
Subject:	Re: BCC2GRX patch 3 (?)
To:	phc27 AT rz DOT uni-kiel DOT dbp DOT DE, djgpp AT sun DOT soe DOT clarkson DOT EDU

Dear Hartmut,
(cf. Csaba Biegl)

(Okay, I see the reasoning about the patches.)

As per your questions about my 256-color problem with BCC2GRX/LIBGRX,

>I've some questions concerning your 256 color problem :
>
>  - are there problems with the original dj driver (.grd) (The old style
>    drivers always use 256 colors) ?

Yes, the same problem.

>  - 320x200x256 mode ok ?

No. Any 256-color mode by ativga.grn and ati.grd have the problem.
And, 320x200x256 mode by stdvga.grn also have the same problem.
So, I guess the problem is not in ati driver.  Two possiblities, my video card
is not standard, or graphics drivers + libgrx malfunctioned.

>  - did you check the bios mode numbers from ativga.asm against your
>    documentation ?

Yes, it seemed to be okay.  The ROM BIOS version of my ATI VGA Wonder card is
VGA1024 V5M-1.00.  I have had no problem with 256 color mode on other
applications(Non-LIBGRX).  Indeed, I am using an image file viewer(written by
myself with BCC/TCC + SVGA256 bgi driver(from an archive)) in 256 color mode,
and have no problem. I don't know where the problem with LIBGRX/BCC2GRX is.

>  - The paging mechanism differs between different ati cards.
>    If you use a VGA Wonder XL you may use to change the driver's paging
>    routine. (Best way would be to detect the actual ATI card and to enable
>    the correct paging code)

I am not familiar with this.  I have an info doc for programming ATI VGA
Wonder, but I don't have enough time to digest it.

>  - Did you contact Csaba ? (LIBGRX 1.03 will come soon, so try to fix
>    the problem before it's out ... )

No.  Probably I should do, but I mistakenly deleted all my emails. Could you
forward some of my previous messages to him if you still have? 
I don't know his email address, so I post this to the list-server.

Thanks.

Wonkoo Kim
EE, U. of Pittsburgh
wkim AT vms DOT cis DOT pitt DOT edu

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