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Path: utzoo!mnetor!seismo!ut-sally!husc6!necntc!ames!ptsfa!nonvon!apn
From: apn@nonvon.UUCP (root)
Newsgroups: comp.sys.ibm.pc
Subject: Re: EGA: How do I find the values of the colour registers?
Message-ID: <380@nonvon.UUCP>
Date: Mon, 18-May-87 13:12:49 EDT
Article-I.D.: nonvon.380
Posted: Mon May 18 13:12:49 1987
Date-Received: Tue, 19-May-87 04:22:44 EDT
References: <8320@watdaisy.UUCP>
Distribution: comp
Organization: NONVON Systems Computer Research Group
Lines: 55

in article <8320@watdaisy.UUCP>, datanguay@watdaisy.UUCP says:
>> How about using int 10, ah=10,al=0,bh=color value, bl=palette register
>> or if setting all of them then try
>> [....]
> 
> Oops. Sorry for the lack of clarity, but I want to *read* the values of the
> palette registers, not write them. Thanks...
> 

	That one is a bit tougher. The EGA card you have is probably based
on the C&T chip set.   DId you say you would like to be hardware independant 
on this ?? (*laugh* *cough*)   One way to do it independantly is to write
a system "extension"  and filter all int 10 calls and trap the useful infor-
mation and keep around in ram somewheres. Then just jump to where the old
int 10 went to. This is the only system/hardware independant way that I found.
Now for some hardware dependent methods:
C&T chipset : no way!! palette registers are W/O (write only)
paradise chipset  : roumor is that it is possible 

Possible help:  Some mouse drives do the above for you... lets see who:

logitech : Yes, ega functions can be done through logitech
microsoft : Yes, ........... (same).....,.................
             however, since m/s 's drivers are not written by them
	    I am not sure if the version they are now shipping does this
            or not... It is certainly not in their application note. 
	    After talking to the people that write their drivers I 
	    concluded that (see note below) it was a very new feature
	    and may only be in house as of 1/87
contriver: no way. This driver does not even know about EGA cards
           (or pretend to!!)


In either case, it may be easier to do the stuff youself and not
bother with the 3 zillion versions of mouse drivers around.


(note: as promised up above somewheres)
  I contacted the driver people a while back because I was in a position
of needing a much-more-flexible-than-what's-available driver written for
a new (and actually working and available) pointing device. I'm still
writting it, after 2 months and plan to make it public domain unless you
are one of the above mentioned  companies (*evil grin*)



Alex P Novickis
Fulcrum Consulting


UUCP: {ihnp4,ames,qantel,sun,seismo,amdahl,lll-crg,pyramid}!ptsfa!nonvon!apn

{* Only those who attempt the absurd   ...   will achieve the impossible   *}
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