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From: drtiller@uokmax.ecn.uoknor.edu (Donald Richard Tillery Jr)
Newsgroups: comp.sys.amiga.graphics
Subject: Re: What is Dynamic HiRes ??
Message-ID: <1991Mar14.034424.4421@uokmax.ecn.uoknor.edu>
Date: 14 Mar 91 03:44:24 GMT
References: <1991Mar9.154602.10536@daimi.aau.dk> <1991Mar11.152144.24040@ucunix.san.uc.edu>
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK
Lines: 10

Actually SHAM and Dynamic HAM are different.  SHAM uses the copper to change
the palette on every other interlaced line or every non-interlaced line.
Dynamic HAM also uses the processor along with the copper to change the
palette on every interlaced scan line.  This means that SHAM can multi-task
and cannot go very far into the overscan area, while Dynamic HAM cannot
multi-task (the software has built in disk check to compensate for the
forbid() call) and can extend much more into the overscan areas.  Dynamic
Hi-Res is the hi-res version of Dynamic HAM and cannot multi-task either.

Rick Tillery (drtiller@uokmax.ecn.uoknor.edu)