Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!haven!umd5!brett
From: brett@umd5.umd.edu (Brett Bourbin)
Newsgroups: comp.sys.amiga.tech
Subject: Copper Programming
Message-ID: <5050@umd5.umd.edu>
Date: 23 Jun 89 17:19:46 GMT
Reply-To: brett@umd5.umd.edu (Brett Bourbin)
Organization: University of Maryland, College Park
Lines: 28


	What I have been trying to do is write a short User Copper list that
calls my private hardware copper list.  The User Copper list simply waits for
the first line of the screen, where the changes need to be made, then loads
COP2LC with the address of the private list, finally accesses COPJMP2.  When
I use the following code, the screen gets all jarbled:

	if ( !( vp->UCopIns = (struct UCopList *)
		AllocMem( (long) sizeof (struct UCopList),
			MEMF_CHIP|MEMF_CLEAR ))) goto FAIL;

	ucl = vp->UCopIns;
	CINIT( ucl, 10L );
	CWAIT( ucl, (long) STARTLINE-1, (long) width-1 );
	CMOVE( ucl, custom.cop2lc, (long) (privatecop >> 16) & 0xffff );
	CMOVE( ucl, (*((UWORD *) &custom.cop2lc+1)), (long) privatecop &0xffff );
	CMOVE( ucl, custom.copjmp2, 0L );
	CEND( ucl );

	Can someone tell me where I am going wrong?  It looks to me like the
correct way to do it, but since it doesn't work, I guess there is a better
way.  8^)

-- 

--Brett S Bourbin, Instructional Computing Programs -- Univ of Maryland
            Computer Science Center, College Park, MD 20742
       INTERNET: brett@umd5.umd.edu  BIX: brettb  DELPHI: brettb