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From: cmm@en.ecn.purdue.edu (Chris M McKinsey)
Newsgroups: comp.sys.apple2
Subject: Re: 3200+ colors
Message-ID: <1991Jun24.143726.10040@en.ecn.purdue.edu>
Date: 24 Jun 91 14:37:26 GMT
References: <9106241405.AA21887@apple.com>
Organization: Purdue University Engineering Computer Network
Lines: 41

In article <9106241405.AA21887@apple.com> PYC121@URIACC.BITNET (Andy Kress) writes:
>
>    Ok....we can now change the pallet for everline on the screen.  But
> can we change the pallet of a line while the beam is scanning across
> that line in order to get more than 16 colors on the line?
>
> +--------------+-------------------------+----------------------------+
> |  Andy Kress  |  Univ. of Rhode Island  |  PYC121 AT URIACC.URI.EDU  |
> +--------------+--------+----------------+----------------------------+
> |  No, it's not a Mac.  |  Apple II: The power to rule the world!!!   |
> +-----------------------+---------------------------------------------+

To: PYC121@URIACC.BITNET
Subject: Re: 3200+ colors
Newsgroups: comp.sys.apple2
In-Reply-To: <9106241405.AA21887@apple.com>
Organization: Purdue University Engineering Computer Network
Cc: 
Bcc: 

>
>    Ok....we can now change the pallet for everline on the screen.  But
> can we change the pallet of a line while the beam is scanning across
> that line in order to get more than 16 colors on the line?
>

Yes, it's possible. Anything is possible, though. You can monitor the
softswitch at $E0C03E/3F to read the horizontal beam location. Now whether
or not you can get the GS to read this beam fast enough as to change the
palette at the exact same pixel everytime around is another story. I would
have to say: no. But I think only experimentation will yield the truth. So
to answer your question, yes, it is possible to change the palette while the
beam is in mid-line. But, it may not look all that well.

On another side, a friend of mine claims to be working on a 4096 color viewer
for the IIgs. He mentioned it had 3 unfolded code segements each 64k in size
to do the palette/color switches. I'm anxious to see if he can pull it off.

Chris M. McKinsey
AOL: McKinsey
GEnie: A2pro.Chris