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From: bartonr@jove.cs.pdx.edu (Robert Barton)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Fast Scrolling
Message-ID: <2082@psueea.UUCP>
Date: 12 Dec 89 13:45:56 GMT
Sender: news@psueea.UUCP
Reply-To: bartonr@jove.cs.pdx.edu (Robert Barton)
Organization: Dept. of Computer Science, Portland State University; Portland OR
Lines: 13


 Jeff.Petkau@weyr.FIDONET.ORG (Jeff Petkau) writes:
>  Also, ScrollVPort() doesn't work on interlaced screens (bug).

  WaitBOVP() doesn't work right with interlace, either.  These routines
both use a piece of code that tests bit 4 of the high-order byte of
ViewPort.ClrIns.  In other words, it looks like someone wrote

      BTST    #V_LACE,v_Modes(A0)

instead of

      BTST    #2,vp_Modes+1(A0)