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From: lsr@apple.UUCP (Larry Rosenstein)
Newsgroups: comp.sys.mac
Subject: Re: Mac II Video Glitches
Message-ID: <6603@apple.UUCP>
Date: Mon, 2-Nov-87 12:13:18 EST
Article-I.D.: apple.6603
Posted: Mon Nov  2 12:13:18 1987
Date-Received: Thu, 5-Nov-87 23:49:47 EST
References: <4222@iuvax.UUCP>
Reply-To: lsr@apple.UUCP (Larry Rosenstein)
Organization: Advanced Technology Group, Apple Computer
Lines: 28
Keywords: Mac,Video

In article <4222@iuvax.UUCP> viking@iuvax.UUCP (Jon W. Backstrom) writes:
>
>I didn't notice it until I upgraded the Mac II to 5 Mb of memory.  After
>that, if I used *any* video mode with more than 2 colors, I get an
>interesting video artifact...
>
>A CLOCK!!  If I use the 4 color mode, I can see a tiny clock with full

This indicates a program that is writing directly to the screen.  The your
monitor is set of more than 2 colors/grays, then the code which writes
directly to the screen will not work properly because the display memory is
organized differently.  

You will see this effect in other places (eg, MacPaint).  Until the
offending program is updated, there is nothing you can do but change your
screen to 2 color mode.



-- 
Larry Rosenstein

Object Specialist
Apple Computer

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