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From: mdavis@pro-sol.cts.com (Morgan Davis)
Newsgroups: comp.sys.apple
Subject: Re: Border color
Message-ID: <8903181756.AA05520@crash.cts.com>
Date: 18 Mar 89 16:39:08 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: pnet01!pro-sol!mdavis@nosc.mil
Organization: The Internet
Lines: 11

Dan Bornstein describes the method by which one changes the border color
register on the IIGS.  You have to be careful with the upper nibble in this
register because it is used by the Real Time Clock (RTC).  However, Dan's
example showed 16-bit memory access being made to the $E0Cxxx area.  Is it not
unsafe to do this?  When you fetch 16 bits from a location here you could
possibly be hitting a softswitch.  I think it might be better to drop into
8-bit accumulator mode when working in the peripheral RAM area.

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