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From: bryce@COGSCI.BERKELEY.EDU (Bryce Nesbitt)
Newsgroups: comp.sys.amiga
Subject: Disabling colorburst & screen hack
Message-ID: <8705291521.AA14643@cogsci.berkeley.edu>
Date: Fri, 29-May-87 11:21:36 EDT
Article-I.D.: cogsci.8705291521.AA14643
Posted: Fri May 29 11:21:36 1987
Date-Received: Sun, 31-May-87 06:36:19 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 32

I am currently enjoying the "oportunity" to use a composite color monitor
with my Amiga while my "MultiSynchronous" monitor is "AntiSychronous".
I decided to try to improve my outlook on life by disabling colorburst.
I took a working "setlace" program that sets the lace bit in gb_system_
bplcon0 and modified it to set/clear the COLORON bit instead.  Sadly,
this did not work.  Seems that it gets set to 1 whenever the copperlists
are built by RemakeDisplay().
While mucking with a copper-list disassembler (thanks, Matt) I ran into
a bizare setting.  While it can't match any of Leo's gems, here is
a cute screen hack:
--------- cut ---------
begin 777 screenhack
M```#\P`````````!``````````````!-```#Z0```$TH2"@`+'@`!)/)3J[^3
MVBI`<``B+0"L9A)![0!<3J[^@$'M`%Q.KOZ,>``O`'X49UY#^@"+<`!.KOW8"
M*@!G4$ZN_WPL12!N`"(@:``$(`AA``!^(F@`!"`)80``=#@H``@,F0$`H@!7?
MS/_X9@HC/`$`(`!^`&`**WP```!X`)1^"BQX``1.KO]V(D5.KOYB+!]G#BQX6
M``1.KO]\(D9.KOZ&(`=.=4)R>6-E($YE<V)I='1D;W,N;&EB<F%R>0!G<F%P.
M:&EC<RYL:6)R87)Y`$CG\,);CUN/($]T!^F8(@`"00`/$/L00%'*__(0O``*;
M+'@`!$/Z_[U.KOYH2H!G("Q`3J[_Q"(`9Q8D#W8)3J[_T").+'@`!$ZN_F):I
=CUJ/3-]##TYU,#$R,S0U-C<X.4%"0T1%1@```_()8
``
end
--------- end --------- (uuencode from FISH #53)
For the curious this TOTALY mangles the copper list, changing a MOVE
to bplcon0 from $A200 to $2000.  It will only work if INTERLACE is OFF.
And, no, I won't tell you what it does.
-------------
         Ack!  (NAK,EOT,SOH)
 |\ /|  .
 {o O} .  bryce@cogsci.berkeley.EDU -or- ucbvax!cogsci!bryce
 ( " ) 
   U      Single tasking?  Just say *NO!*