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From: viking@iuvax.UUCP (Jon W. Backstrom)
Newsgroups: comp.sys.mac
Subject: Mac II Video Glitches
Message-ID: <4222@iuvax.UUCP>
Date: Fri, 30-Oct-87 03:01:47 EST
Article-I.D.: iuvax.4222
Posted: Fri Oct 30 03:01:47 1987
Date-Received: Wed, 4-Nov-87 05:48:36 EST
Organization: Indiana University CSCI, Bloomington
Lines: 29
Keywords: Mac,Video

Has anyone else noticed small horizontal bars about 2-3 pixels from the
top of the screen when using the 256 color mode on Apple's Mac II video
card?  I thought this was something specific to my system (blown memory
on the video card or something), but now I've seen it on three other
Mac II displays.

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
hour:minute:second format.  As you progress to 16 and 256 colors, the display
simply looks 'gliched'.  I tried removing "Menu Clock" from the system folder,
thinking it was a bug from that program but that wasn't it.

What is it?!  Has anyone else seen this phenomenon?


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|  Jon W. Backstrom             "Yah sure...we gonna have fun, you bet!"      |
|  Computer Science Department                                                |
|  Indiana University           UUCP: {ihnp4,pyramid,rutgers}!iuvax!viking    |
|  Lindley Hall 101             ARPA: viking@iuvax.cs.indiana.edu             |
|  Bloomington, IN  47405                                                     |
|                               "The world has arrived at an age of cheap     |
|  (812) 335-2849 (Office)       complex devices of great reliability; and    |
|  (812) 336-3660 (Home)         something is bound to come of it."           |
|                                                 - Vannevar Bush (1945)      |
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